I wish I could be giving this a better review, but unfortunately my 6 y/o cat never used it. After 2 weeks she seems to be scared of the noise as it is a little loud when it automatically rakes and she didn’t like the texture of the crystal litter it comes with. I did put some dirty litter in the new box so she can want to go in it but it didn’t work. It also didn’t do very well at scooping it out. 
The idea of the box was great, it has an app that’s super easy to use but after 8 rakes it recommended a new tray of litter even though it was never used. 
Overall I think this might work for a younger cat.