We have 2 cats and 1 refuses to use the same litter box.  She has decided that to punish us by urinating and pooping on my bathroom carpeted floor! So I bought this liter box and set it next to the covered box. They both share THIS box!! Infact, they hang out just to watch the rake do its thing. As long as PetSafe continues to make the replacement trays, we will be keeping this litter box and pack away the others.