I bought it for the hard-to-reach windows, but because it is so easy, I also use it for all easily accessible windows. Then you notice that not all windows are suitable. For example, it gets stuck under a handle and under the profile of the Velux curtains. Even if a window is too small, it gets stuck.
But it does the larger windows very well. I don't need a window cleaner anymore. I can do about 30 windows with it and then it has to load again. You cannot use it while it is charging. Still a great achievement, because if I have to do it by hand I don't do more in one go.
It is recommended to work with Fast Cleaning indoors and outdoors with the heaviest setting, but the result with Fast Cleaning is also perfect for outdoor use. Then it takes about 2 minutes per window. So you always have to stay with it to place it on the next window, so you are constantly exposed to noise. But compared to a vacuum cleaner, I think it's not too bad.
After about 100 windows it is necessary to buy a new bottle of cleaning fluid.