I don't know how it got such good reviews. They have to be reattached to fit, and my Roomba picks up half as much dust and dog hair as it used to. I just bought a new robot vacuum and got it working for a rumba. The Roomba picked up next to nothing while the new vacuum picked up so much dust/hair that it started overflowing and had to be emptied to keep working. Do not stack this product and return it within the return period