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Robot Autonomy, Classified
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ComparisonGardena Sileno Life 750 and Stihl iMow 7

Up to three

All robot lawn mowers. Every figure below is placed against the whole class, so a gap can be read against how much the class itself varies.

Where each one suits you.

The conditions each robot was assessed against, side by side. Rows marked in gold are where these machines genuinely differ.

Fit verdicts by condition for each robot
Condition Sileno Life 750 Stihl iMow 7
Yard size
Under ¼ acre GoodWell within 750 sq m rating; no scaling concern for small residential yards. GoodOversized for small yards; covers efficiently but underutilizes runtime capacity.
¼ – ½ acre GoodTypical suburban lawn zone falls within rated 750 sq m coverage; single-unit operation sufficient. GoodIdeal deployment zone; systematic pattern and 420-min runtime cover this range in single session.
Over ½ acrethey differ PoorRated coverage maxes at 750 sq m; larger estates exceed capacity and require multiple mowers or external perimeter zoning. DependsRated 5,000 sq m (~1.24 acres), the top of the iMOW range; larger yards need a second machine rather than a larger one.
Terrain
Mostly flat GoodOptimal operating condition; GPS positioning and wire-following both reliable on level ground. GoodFlat terrain is the baseline; iMow 7 excels without slope challenges limiting traction.
Gentle slopesthey differ DependsSlopes 10–15° manageable; slopes >15° introduce traction loss and wire-tracking drift per owner reports. GoodRated to 45% gradient; moderate slopes are well within operating specifications per owner reports.
Steep / hillythey differ PoorRated for gradients under 25% per specs but owner reports document traction failure >20% on wet grass; not recommended for steep properties. DependsNear the 45% limit on wet grass, traction degrades; dry conditions perform better than wet.
Grass type
Typical lawn grass GoodStandard cool-season turf (fescue, bluegrass) cuts reliably at 20–60mm heights per specification. GoodStandard turf and lawn grasses are the design baseline; systematic mowing pattern optimized for normal growth.
Mixed / tall growth DependsTall fescue and other coarse grasses cut at upper range (50–60mm); may require multiple passes weekly for dense growth. DependsTall or overgrown grass may require multiple passes; blade wear accelerates with dense growth.
Thick (Bermuda / Zoysia) DependsThick Bermuda or St. Augustine grass at lower mowing height (20–30mm) increases blade dulling; weekly inspection necessary. DependsThick Bermuda or St. Augustine grass reduces cut speed; may require reduced cutting-height settings or longer run-time allocation.
Boundary setup
Wireless required PoorThis model requires 1.6mm boundary wire; no RTK or wireless boundary option available. PooriMow 7 requires physical perimeter wire; no wireless virtual-boundary option available.
Wire required GoodDesigned for perimeter-wire operation; installation straightforward with Gardena wire and connectors included. GoodPhysical perimeter wire is the required boundary system; installation is a one-time setup cost.
No preference GoodUses perimeter wire. Fits readers with no boundary preference; wire is required. GoodUses perimeter wire. Fits readers with no boundary preference; wire is required.

A robot being poor for a condition is a fact about fit, not a fault. “Depends” means the record names a limit worth reading, not that the answer is unknown.

Keep going.

The full recordGardena Sileno Life 750Specifications, evidence, the Fit Check in full, and every tracked change.The full recordStihl iMow 7Specifications, evidence, the Fit Check in full, and every tracked change.

Robovations classifies robots; it does not rank them. Nothing on this page is a recommendation, and no manufacturer influences a classification or its placement here.