I love that this box cleans quickly and the trays are a easy to change.  No problems transitioning our 2 cats to this new box.  I have not been disappointed. The ScoopFree box was easy to set up. It is also easy to clean, only requires to be cleaned once a month, does not smell and there are no crystals on the floor around the litter box.  It works just like it is supposed too.  I haven't had to change the box for 3 weeks and there's no odor. Best litter box ive used!