We had the smaller version of this box for approximately 15 years before it gave out and broke.  I loved it so much that I wanted to get another one. Due to the large size of one of our cats we decided to get the Mega one.  These machines eliminate order in the house and keeps our dogs away from the box.  Some clumping litters can have the tendency to jam the machine, but the few times to un jam it are still worth having it.  Make sure not to over fill it with litter, we rarely have a problem.