The PetSafe - ScoopFree Classic Self-Cleaning Litter Box works really well. My one cat jumped right in and the others took a little while to like it. It is easy to set up.  I dont smell anything at all so it is keeping it smell free. It has directions on what the different lights mean. It scoops all the solid waste out and keeps it looking fresh.  My cats do not kick this litter out like the other litter they have used.  You can also buy a shield if you want to make it a covered cat box.  It is a quality product.