So far so good!  I am totally in love with this litter box!!  It was easy to set up and understand.  My cat took to it with no problem.  I haven't had to scoop the litter in several weeks!  No odor, no scooping, no nothing!  It works exactly like it says it will.  Cat goes in, does his business and 20 minutes later, the rake moves across the box, scooping the "stuff" into a hidden compartment.  I haven't had to change the litter tray yet, but if it's anything like using the box, easy peasy, I'll be super happy!