The robot copes with its functions, does not wash corners - but not a single robot does this. This should simply be accepted as a fact. If you have a lot of windows, or floor-to-ceiling glazing, or live high up, then this is a necessary device, glass washing simplifies, it does not leave streaks. Of course, he does not wash the frames, as well as the fittings. I also wash the tiles in the bathrooms and in the kitchen, but here it is important that the tile is even, on the relief it loses its “adhesion” to the surface. They say that they also wash stone floors with it, I have not tried it, since there is no need.