I have to say this is a nice litter box. Easy assembly. At first my cat didn't know what to think of it because he was used to a regular litter box. I put it beside the other litter box as said but I removed it and left this one. It occasionally clean itself with nothing around it but that doesn't bother me. The cat likes to play with it and will walk over it to get it to activate. I know crazy cat lol. Haven't changed it yet or bought the refill for it since its only been a week. I like not having to scoop litter. Very happy with it.