Gardena smart Sileno free 800 · Goko M6

Satellite positioning here is corrected over the internet, not by an RTK base station. Published accuracy is roughly 10 to 30 cm, against the centimeter-level figures consumer RTK mowers from Segway Navimow and Mammotion had been selling at and below this price for two seasons before the Sileno free arrived. Canopy shadow degrades the fix; cloud does not.

Maintenance is seasonal, not absent. The mower mulches, so there is nothing to empty and no clippings to dispose of, but blades are a yearly consumable and the machine and its charging station both need winter storage.

An industrial-robotics pedigree and a proven multi-sensor navigation approach (VSLAM plus RTK plus IMU) support the engineering claim, but this is RobotPlusPlus’s first consumer product, funded through Kickstarter, with no shipped units yet to test either claim against.

Dense tree canopy or urban canyon settings

Heavy overhead obstruction degrades the satellite fix below usable thresholds. A dropout ends in a stopped mower that has to be collected and restarted by hand; Gardena's guidance is open-sky operation.

Steep or clay-heavy terrain

Gardena rates the machine for 30 percent (about 17 degrees) inside the working area, with a lower 15 percent (about 9 degrees) limit at the boundary. The boundary figure governs where the virtual edge can be drawn and is the one most owners meet first. Wet clay and soft turf cost traction below either number.

Owners requiring zero seasonal intervention

Blade replacement annually and pre-winter storage are non-negotiable tasks. Subscription or auto-shipping programs do not yet exist for Gardena consumables.

Heavy-use lawns that will wear blades faster than once a year

Blades are replaced, not sharpened, and Gardena documents no mid-season replacement cadence. A rough or heavily seeded lawn means buying blade sets on observation rather than on a published schedule.

Buyers needing a mower available for purchase and delivery now

As of this research the M6 has not shipped to any customer; it is in Kickstarter-funded preorder status with a reported October 2026 first-batch date.

Buyers who require independently verified slope performance before purchase

The 90% slope-traversal claim is a manufacturer marketing figure without independent verification.

Buyers who require a documented blade-safety specification

No specific blade-stop-on-lift timing was found; an off-ground alert is documented as part of the anti-theft system rather than as an explicit blade-safety feature.