What a great product. I have used other "self cleaning" litter boxes and was happy with it until we rescued a kitten. We were having to change out the litter ever 2 weeks and for $50 for 3 trays it was getting expensive. Finally bite the bullet and got this box from a friends recommendation and we absolutely love it. Took a bit of minor construction for us to get the box hooked up to the toilet but we figured it out. Only 3 Cons. First having it drain into the toilet makes you have to clean the toilet more often; second, we have to replace the granules often since my cats track them everywhere; and third, the cleaning process is a bit long and I was having issues with the kitten going on the floor because he couldnt wait. (We changed to 4 cleanings a day instead of cat activated and it has currently resolved the issue due to less cleanings). Over all great products.