When I got my cats, about 5 years ago, I spent a long time reading reviews on self cleaning litter boxes. The only common thread was that when people got frustrated with the box they had purchased they got a Litter Robot. So, I decided to skip the frustration and get one and I am so very, very glad I did. After five years the Litter Robot still works as it did on day one and almost all of my cat owning friends have gotten one for themselves. I highly recommend the Litter Robot. It is amazing and every cat parent should have one.