My Review for ScoopFree® Classic Self-Cleaning Litter Box Is as follows: it’s the  best type of litter box for my finikey cat. My cat will not use the regular litter box because she hates the clumping type. She ends up pooping outside the box. Now this litter box does not need constant attention it’s basically cleans itself. The crystals absorb the smell and the litter is always clean.