This is my 3rd roomba (the others are still going strong with updates) but the beater bars/brushes are horrible. I have replaced them but the new ones, pricey to replace...are so noisy and now my roomba is having problems and not finishing or starting jobs...Very expensive roomba to be having these problems. Aren't there supposed to be improvements when you upgrade? My first roomba is 13 years old still is fantastic and updated it not as frequently or $$ to do it.