The device is recommended for purchase. It draws perfectly to the window - you should not worry. Wash well. A large window of 6 blocks takes 30 minutes.
Pros
I live on the 18th floor, windows to the floor. Washing yourself is scary. Ordering cleaning is scary during a pandemic and you don’t want to overpay. The robot perfectly washes even dirty windows. The main thing is to read the instructions and do not spare the rags from the kit.
Cons
I had to tighten the fastening of the brushes myself, which is a shame in a device for 16 thousand. Washes corners relatively poorly, but these pieces are very small.