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The verdict. On price alone the Ecovacs GOAT O1000 RTK at $999.99 is the cheapest capacity here, at $4,000 an acre. On the full ledger it finishes last at 38.3 of 100, behind the Segway Navimow i210 AWD at 51.0, the Mammotion LUBA mini 2 AWD at 48.8 and the eufy Robot Lawn Mower E15 at 46.8. The reason is a twelve-month warranty that names batteries as an excluded consumable, and a documented critical vulnerability on Ecovacs’ own previous mower generation. The cheapest acre on this page is not the cheapest mower to own.
Updated August 31, 2026: prices, coverage claims and slope figures re-read from each maker’s own store. The per-acre price table carries the footnote that undermines a simple ranking, the boundary-slope finding, the Ecovacs CVE record, and the disagreement between Consumer Reports and Stiftung Warentest on child detection. Segway has quietly dropped the X315 from its own collection page while still selling it.
Published July 16, 2026 · Updated August 31, 2026 · By Nate Colburn
Pricing Four Mowers From $4,000 to $9,000 an Acre
Every one of these machines is sold on a coverage number. Divide the maker’s own price by the maker’s own acreage and the spread is wider than the sticker prices suggest.
| Model | Maker’s own price | Maker’s own maximum area | Dollars per claimed acre |
|---|---|---|---|
| Ecovacs GOAT O1000 RTK | $999.99 | 1/4 acre | $4,000 |
| Segway Navimow i210 AWD | $1,149.00 | 0.25 acre | $4,596 |
| Mammotion LUBA mini 2 AWD 1500 | $1,799.00 | 0.37 acre | $4,862 |
| eufy Robot Lawn Mower E15 | $1,799.99 on the product page, $1,299.99 on eufy’s own collection page | 0.2 acre (8,700 sq ft) | $9,000, or $6,500 |
The arithmetic, shown: $999.99 ÷ 0.25 = $3,999.96. $1,149.00 ÷ 0.25 = $4,596.00. $1,799.00 ÷ 0.37 = $4,862.16. $1,799.99 ÷ 0.2 = $8,999.95, and $1,299.99 ÷ 0.2 = $6,499.95.
Two things fall out before you reach any spec. eufy is the most expensive capacity here at either of its own prices, between 1.6 and 2.25 times the Ecovacs. And eufy publishes two prices for one machine on its own website on the same day: the product page and the E-series landing page both say $1,799.99, the lawn mower collection page says $1,299.99 with $500.00 marked as saved.
Prices are approximate, current as of publication, and change frequently — confirm the latest price with the retailer before buying.
Reading Segway’s 1.2x Map Footnote Before Trusting the Acreage
Now the part that makes the table above less decisive than it looks, and I would rather undercut my own number than let you use it wrong.
Segway attaches this footnote to its mower pages: “Supports map storage up to 1.2× the recommended mowing area (e.g. up to 1.2 acres for a 1-acre model). Actual mappable area may vary depending on yard layout and complexity.” The advertised acreage is a map budget, not a lawn. It is shared across every zone you draw, so a front, a back and a side strip all draw from the same pool.
Segway publishes the upward band on several models in the same breath: the X450 “may support a maximum mowing area of up to 1.8 acres” against a 1.5-acre headline, the H220 up to 0.6 against 0.5, the i215 up to 0.44 against 0.37, and the i206 up to 0.18 against 0.15. That is a consistent 20 percent of headroom, stated by the maker.
Apply it to the i210. At 0.25 acre the machine works out at $4,596 an acre; at the 0.30 acre its own footnote allows, $1,149.00 ÷ 0.30 = $3,830.00. Segway’s own published band runs $3,830 to $4,596, and that band contains the Ecovacs figure of $4,000 outright and comes within $266 of the Mammotion.
So the honest reading of the first table is this: three of these four mowers sit inside one maker’s own stated uncertainty, and the ordering between them is not a real ordering. Only eufy is far enough out to be a genuine result. And the downside is worse than the upside, because Segway publishes a ceiling and no floor — “actual mappable area may vary” with complexity, and it does not say by how much.
Counting the Slope Twice, Because Two Makers Publish Two Numbers
The slope rating is the second number people buy on, and on two of these brands it comes in a pair.
| Model | Headline slope | The figure that governs the edge | Conditions the maker states |
|---|---|---|---|
| Mammotion LUBA mini 2 AWD | “80% (38.6°)” | Not published | None stated |
| Segway Navimow i210 AWD | “up to 45%(24°)” | Not published for this model | “Measured under test conditions with 1.97 inch grass height, dry grass surface, and a slope free of obstacles.” |
| Segway Navimow i110 | “30% (17°)” | “10%(6°)” at boundary | None stated |
| Ecovacs GOAT O1000 LiDAR PRO | “45%(24°)” | 17% for virtual boundary | “Experimental result operated by ECOVACS Laboratory… Actual results may vary” |
| eufy E15 / E18 | “18°” | Not published | “For grass under 3.5 inches and flat lawns (height difference under 1.2 inches). Not suitable for St. Augustine and dense Zoysia.” |
The boundary figure is the one that decides whether a machine works on your property. A mower that climbs a 30 percent grade mid-lawn but holds a virtual boundary only at 10 percent will not finish a sloped yard, because on most sloped yards the slope runs to the edge. Segway prints 30 and 10 for the i110. Ecovacs prints 45 and 17 for the O1000 LiDAR PRO. Both sit on the maker’s own page, and the small one never makes the headline.
I could not find a published boundary figure for the Mammotion, the eufy, or the Segway i210 AWD. That may mean they do not have the limitation. It may mean they do not print it. Read the second number carefully on any model that has one, and ask about it on any model that does not.
Segway’s test setup is worth reading twice as well. Its 45 percent was measured on grass just under two inches, dry, with no obstacles on the slope. Wet grass on a hill with a tree root in it is not that test.
Weighing Safety When Consumer Reports and Stiftung Warentest Disagree
This is the most important section on the page and it does not resolve.
Consumer Reports published its robotic mower testing on July 14, 2026, covering six machines: the Segway Navimow i105N and X315, the Mammotion Luba 2 AWD 3000X and Luba Mini AWD 800, the eufy E18 and the Ecovacs Goat O1000 RTK. CR states that “We assess whether the robotic mower stops when a person gets close to it and whether its blades stop automatically if someone attempts to lift it,” and reports top marks for safety among the models it recommends.
Stiftung Warentest published its own test on March 23, 2026, covering 14 mowers including Anker Eufy, Ecovacs and Mammotion. Its protocol goes further: alongside adult and child foot dummies, testers used a wooden replica of a crawling child’s arm, 4 cm across and 55 cm long, and hedgehog dummies. On whether the machines detect the foot replicas in time, Warentest’s own free preview says, in German, that many do not.
Two of the most credible consumer testing organisations in the world, same product category, same year, and they do not agree on whether these machines detect a child. I am not going to pretend one of them is right. The protocols differ, the model samples differ, and Warentest’s full results sit behind a €4.90 paywall. A German outlet summarising the paywalled issue reports that ten of fourteen machines drove over the wooden arm; I could not verify that count at test.de itself, so treat it as secondary reporting rather than as Warentest’s published figure.
What is not in dispute: no US safety certification is required. The CPSC lists ANSI/OPEI 60335-2-107-2020, “Particular Requirements for Robotic Battery Powered Electrical Lawnmowers,” under voluntary standards. And the one mandatory federal mower rule does not reach these machines at all: 16 CFR Part 1205 covers “A grass cutting machine either pushed or self-propelled… normally controlled by an operator walking behind the mower,” and requires the blade to “come to a complete stop within 3.0 seconds after release of the control.” A robot mower has no operator walking behind it and no control to release. The three-second figure you see quoted for robot mowers comes from a rule that does not apply to them.
None of the four publishes a certification number against the voluntary standard on its US product pages. Every one of them necessarily holds an FCC equipment authorisation for its radios, and those are publicly searchable. The transmitter is regulated and the blade is not. Run yours when the yard is empty and follow the manufacturer’s own guidance on children and pets, whichever machine you buy.
Scoring Four Robot Lawn Mowers on Five Axes, With the Tally Shown
Weights are mine and the reasoning is beside each one. The first axis scores how much independent testing exists on the exact model you would buy, not how safe the machine is; the published evidence does not support scoring the second thing.
| Axis and weight | Why it carries that weight | Segway i210 AWD | Mammotion LUBA mini 2 | eufy E15 | Ecovacs O1000 RTK |
|---|---|---|---|---|---|
| Independent testing of this exact model — 30% | Unattended blades in a yard. Somebody outside the company should have looked. | 45 — CR tested the i105N and X315, not this one | 45 — CR tested the previous Luba Mini AWD 800 | 40 — CR tested the E18 sibling; eufy publishes a 5 cm detection floor | 65 — CR tested this exact SKU; Warentest tested the line |
| Warranty and what it excludes — 20% | Three years of grass is the test that matters, and one of these is a one-year machine. | 55 — “3-year warranty,” but “Up to 3-year” on the H2 and no US terms document found | 75 — 3 years on components and battery; blades, discs and cables excluded as wearing parts | 70 — 2 years on mower, base station, adapter and battery pack, published as a table | 20 — 12 months, with batteries named as an excluded consumable |
| Running-cost disclosure — 25% | Blades, batteries and connectivity are the bill after the box. | 70 — blades $23.99 at 80 hours, battery prices for six SKUs, $159.99 to $449.99 | 45 — blades $49.00 with no interval; 4G called lifetime on one page, 3 years on another | 50 — blades $11.99 at 240 hours; no replacement battery sold | 35 — blades $29.99 on a 4-6 week calendar; no battery price |
| Published vulnerability record — 15% | These are internet-connected machines with cameras and radios. | 50 — no NVD record, which means no published research | 50 — no NVD record | 45 — 14 NVD records, all cameras and HomeBase, none a mower | 30 — a CVSS 9.6 critical on its own previous mower generation |
| Certification you can look up — 10% | Low weight, because none of them separates here. | 15 | 15 | 15 | 15 |
| Weighted total | 51.0 | 48.8 | 46.8 | 38.3 |
Ecovacs’ arithmetic, since it is the surprising one: 0.30 × 65 = 19.5, plus 0.20 × 20 = 4.0, plus 0.25 × 35 = 8.75, plus 0.15 × 30 = 4.5, plus 0.10 × 15 = 1.5. Total 38.25, rounded to 38.3.
That is the named loser, and it is the best-tested machine on the page. It still finishes last, because a twelve-month warranty excluding the battery on a $1,000 machine is a short leash, and because CVE-2024-52325, scored 9.6 critical, records that “ECOVACS robot lawnmowers and vacuums are vulnerable to command injection via SetNetPin() over an unauthenticated BLE connection.” That CVE names the GOAT G1 family and the GX-600, not the O1000 you would buy today, and Ecovacs issued advisories. It is the vendor’s record, not this model’s defect, and I scored it that way.
Disagree with 15 percent on vulnerability history and drop it to 5, moving the difference to independent testing, and Ecovacs climbs past eufy. The axes are printed so you can do exactly that.
Budgeting Blades on Three Clocks That Do Not Convert
Four makers, four different units for one consumable.
Segway sells a 12-piece Blade Assembly Plus for $23.99 and says “Typically the blades should be replaced after 80 hours of use.” eufy sells blades and screws for $11.99 and says to “replace all three blades and screws at the same time” after 240 hours. Ecovacs sells a 12-blade kit for $29.99 and gives the interval as “About 4-6 weeks.” Mammotion sells Endurance Replacement Blades for $49.00 and publishes no interval I could find.
Eighty hours against 240 is a threefold difference in stated blade life between two makers of the same kind of machine, and Ecovacs’ figure is a calendar window that will not convert without knowing your run time. None of the four publishes how many blades one change consumes out of the pack it sells you, so a cost per mowing hour is not computable for any of them. I am not going to invent the missing number to make a tidier table.
The connectivity bill is where the real money is, and Segway is the one to watch. Its i105 page footnotes that “Anti-theft requires separate purchase of Navimow Access+ 4G module,” listed at $95.99 on sale against $119.99 regular. Segway also rents mowers outright: Navimow Flex charges $100 a month for the i105 tier covering an eighth of an acre. Twelve months of that is $1,200, against Segway’s own $669 sale price for the same i105. The subscription costs 1.79 times the machine in the first year. Mammotion goes the other way and states that its iNavi service and 4G data are “free for the entire lifecycle of the product” — though its own product pages say 3 years, and I am printing both because Mammotion does.
Positioning has a physical prerequisite too. NOAA’s National Geodetic Survey lists sites unsuitable for a real-time GNSS base station as including “locations under or very near tree canopy.” Segway’s own support article asks for at least 110 degrees of unobstructed sky and no obstacles within two metres. If your lawn is under trees, a government agency and the manufacturer are telling you the same thing.
Naming the Yard Each of These Four Is Wrong For
Segway Navimow i210 AWD, $1,149. Wins this ledger on disclosure rather than on hardware: Segway publishes battery prices for six separate SKUs down to the cent, an 80-hour blade interval, and the fine print on its own coverage claim. It also charges roughly $96 to $120 extra for the 4G module that makes anti-theft work on the entry models. Skip this if your lawn is under mature trees, because the whole platform leans on satellite positioning that NOAA says canopy degrades.
Mammotion LUBA mini 2 AWD, $1,799. The best warranty here at three years including the battery, all-wheel drive rated to an 80 percent grade, and free connectivity for as long as the machine lives — or three years, depending which Mammotion page you open. Note also a pricing inversion on Mammotion’s own store: the LUBA 3 AWD 1500 covering 0.37 acre lists at $2,399 while the LUBA 3 AWD 3000 covering 0.75 acre lists at $2,239. More mower, less money, same page. Skip this if your lawn is flat and rectangular, because the AWD premium buys you nothing there.
eufy Robot Lawn Mower E15, $1,299.99 or $1,799.99. Camera navigation with no RTK antenna and nothing to mount, and a warranty table that covers the mower, the base station, the adapter and the battery pack for two years apiece. Then it charges between 1.6 and 2.25 times the Ecovacs per acre and states in its own footnote that objects under 5 cm tall and smaller than 10 by 10 cm “need to be cleared or marked as No-Go Zone.” Skip this if your yard has a dog toy problem, or if you want the maker to agree with itself about the price.
Ecovacs GOAT O1000 RTK, $999.99. The cheapest acre on the page, the only model here that Consumer Reports has tested by exact SKU, and a published 0.8-inch positioning precision figure that Segway does not match with any numeral of its own. Twelve months of warranty, batteries excluded. Skip this if you expect to still be mowing with it in year three, because at that point you own every component in it outright.
A note on recalls: a search of CPSC’s published recalls found none for Segway, Anker or eufy, Ecovacs or Mammotion robot mowers. The Segway recalls that surface are personal transporters, UTVs and a kick scooter, none of them a mower.
Settling a 2.2-Point Gap Between Segway and Mammotion
Segway 51.0, Mammotion 48.8. Two points on a hundred-point scale is not a verdict, so here is the tie-breaker.
My own money goes to the Mammotion, and it costs me the top of my own ledger to say so. Segway wins on paperwork. Mammotion wins on the two things that are hardest to buy back later: three years of warranty that includes the battery, and connectivity that does not carry a meter. Segway’s answer to anti-theft is a $96 module and its answer to convenience is $100 a month, and both of those are decisions the company can revisit after you have bought the mower. A warranty is not.
Move running-cost disclosure from 25 percent down to 15 and put the difference on warranty, and Mammotion takes the ledger outright at 51.8 against Segway’s 49.5. That is how close this is.
We have gone at the rest of the automated backyard the same way: robotic pool cleaners, what a $1,200 robot vacuum does that a $200 one cannot, and grill formats for when the mowing is finished. The rest lives in beach and backyard.
If you own one of these four and your yard has a slope at the boundary, tell me what it actually managed. That is the number none of these companies will print.
