I've been getting error 2 messages (clean brushes) repeatedly with these replacement brushes. I finally have my original brushes back. No more mistakes. No more unusual noises from the Roomba. The filter works perfectly. I haven't tried side brushes yet. Cleaning tools are very helpful. I don't know what the problem with the brushes is. They look like the originals and fit. Having a single bug every 10 minutes is impractical.