Pros: aesthetically pleasing box that is plenty deep. Kicking out litter is always a problem with crystal litter, but they made it quite deep so this isn't an issue. It's quiet and has great app functionality. My cat was drawn to it from the moment I took it out of the box, and she didn't have a problem moving from standard cat litter to crystal. 

Con: I loathe anything with expensive replacement parts. That said, it does keep this box fresh (which is a constant struggle with the litter robot). So it's a fair trade, as it requires no extensive cleaning.