I recently had the chance to try the ScoopFree Classic Self-Cleaning Litter Box made by PetSafe. My cat got used to this new system right away, by putting a scoop of his old litter in the new tray just one time. Set up is so simple: Just lift the top, place the tray with no-mess crystals down, close the top, plug it in, and it’s ready. It senses when it needs to clean itself and there’s no messy litter to get tracked or dumped by your kitty. Every thirty days or so, throw out the old tray and put in another. Couldn’t be simpler. And no odors. This is a great system.