Ecovacs WINBOT W2 Omni Window Cleaning Robot vs Ecovacs WINBOT W1 Pro Window Cleaning Robot

Reviewed found it lost suction, stopped and threw an error about ten feet up on floor-to-ceiling panes with gaps (it did not fall). How-To Geek says surfaces must be mostly square, without cracks or protruding sections, or suction can break.

How-To Geek found some debris left in corners and along edges that needed a quick wipe by hand. Reviewed, by contrast, saw full coverage to the frame.

How-To Geek calls it pricey for potentially limited uses with a less compelling app. Reviewed calls it too niche for an overall recommendation and says reattaching it pane by pane is simple but tedious.

Techlicious says it must stay plugged in, and the 15.4-foot cord sometimes needed an extension cord; the review title calls it 'held back by its cord'.

Techlicious says it won't work on mullioned windows, decals or curved glass, and lever handles stopped it reaching under them. CHOICE lists minimum glass thickness and frame-height requirements and says you need windows that suit it.

CHOICE measured about 73 dBA, around a stick vacuum, and found the fluid ran out after about 30 minutes against a one-hour rating. Techlicious measured about 68 dB. A Techlicious reader reported streaks on every window within a month.