The new apartment has several large windows, plus a balcony and a high floor - it is unrealistic to wash the glass by hand. I chose a window cleaner so that it works optimally and reliably. This robot sprays water by itself, no need to wet the glass. The safety rope is strong, already tested. There were cases when the light went out, but the washer continued to work on a backup battery. Washes qualitatively, does not leave streaks. But you need to take care of him - wash and change napkins in time.