My cats been using the Scoopfree Classic Self-Cleaning Litter Box and they love it!  The directions to set the litter box up are easy to follow and I love that it has a plug in adapter vs battery operated!  The litter box also came with a tray and one bag of litter, which the cats also really like!  The litter rake activates when no continual motion is detected and clean-up and disposal is so easy!  The motor is very quiet and disposable is incredibly easy! This is a great box to have, especially if you have multiple cats!