1. The density and length of the brushes in the roller are significantly inferior to the original roller. The length is shorter and smaller than the bristles.2. The side brush sometimes falls off. After vacuuming, my kids and I play a little game looking for the side brush around the house.3. The filter seems fine. So far there have been no problems. It works in the end, but I'm not sure how well it compares to the original hardware.