We recently replaced the original roller bars with those from the kit and immediately had problems stopping every 5 minutes, not on some carpets which weren't. had problems rubbing myself on the device before. They were ripped to pieces within 2 weeks and we found a genuine iRobot part and it worked like new. We started with filters (we live on a dirt road and have to be changed monthly), they work perfectly and have to be cleaned of fine dust every day. The rotating brush had issues, but that didn't worry us. They like to break every month. In general I would continue to buy filters from this company but I will not buy this kit again.