One trick I learned with these generic Roomba replacement parts is to keep the original brush ends. This will SIGNIFICANTLY reduce the volume. Otherwise, the cutscenes will sound like Roomba destroying humanity. This kit is perfect for new Roomba owners who don't realize until it's too late that hair is dividing the brushes in half, and yes, iRobot wants $55 to change them every 3 months. The brushes are the best part of this set. The packs match the + versions (anything that doesn't include a clean base, there are cheaper kits available), and the filters and side brushes are pretty much useless unless I remember to change them once a month, which I don't do. Much easier to remember to change them when I need to change brushes.