The brush was working quite well for a few weeks, then began to but, ever louder to rattle. Now, after about three months I renounce already in use, so as not to disturb the neighbors. In addition, the motor stops running when you exert a little pressure on the bristles. That was not so at the beginning. The previous model has kept the way 6 years then it could no longer turn on.
The battery lasts a long time, about three weeks, the cleaning result is very good, otherwise I have no complaints, but the noise, resulting apparently from a mechanical failure is not acceptable. In the shop, the device buzzes whisper! At the price we must something more durable and better processed expect! That's why only 2 stars
