Having two house cats I decided it would be wise to upgrade to better brushes. Installation is easy and Roomba had no trouble recognizing the scrub head. But every time it ran it crashed after 5-10 seconds, sometimes it ran a little longer but it still crashed. I looked at the code and it looked like it was a reservoir, but after cleaning it all still failed. I was about to buy a new one but decided to reset the old cleaning head. And Roomba works fine now. I sent the cleaning head back but will most likely buy it again but not refurbished this time.