I have had the smart self cleaning litter box for a month now and it’s amazing! I have always been a dog person, not a cat person but my husband and son are cat people. I have always hated the smell of cat litter and that deterred me from having a cat. We decided to get my son a kitten for his birthday and with this litter box and the litter trays I do not smell anything what so ever! I have even been in the room while she used the box and couldn’t smell a thing! The crystals do tend to get outside of the box but since they are larger and not super fine it’s easy to maintain and stay close to the box instead of ending up all over my house. I’m so glad I got this!