I have been using original Deebot brushes for a long time and have never lost a single bristle. I was trying to save some $$$ and bought them. The side brushes aren't that great. They didn't last long before the stubble fell off and lay on the ground. The bottom brush isn't very good either. The rubber fins on it tear quickly and easily, which means the device picks up less dirt and debris. With them you get what you pay for. When I wanted to change the brushes, there were almost no bristles left in the brushes. I wouldn't buy them again.