Wasn't sure about the PetSafe - ScoopFree® Classic Self-Cleaning Litter Box because it sounded like it would be a lot of pieces to put together and maintain.  I was pleasantly surprised when I opened the box to find that everything is already together and hassle-free.   
It took my cat a few days to get use to going in this new litter box. The sounds it makes are not bothersome.  And it cleans and works great.  Definitely recommend this product if you have cats and hate cleaning the litter box.  This product is heavy duty and well made.