I recently received the PetSafe- Scoop Free Self Cleaning Litter Box and I have to say its the absolute best Litter box ever! No more scooping the litter every time your cats go in there.At first I was worried about my cats using it because they're so use to using one with a id over top..But, they took right to it,as a matter of fact as soon as I got it ready and set it down they jumped right in to do their business. I'll never use any other litter box since Ive received this one.