I received ScoopFree Classic Self-Cleaning Litter  box from tryitsampling. I have 3 cats and 3 litter boxes. So I scoop at least 6 times a day. I took one box away and put the Scoop free self cleaning box in. They were very interested . Within 6 hours they were in it. Now my job of scooping is only once a week. I can smell the urine within 6 days. So
 I change it weekly. They barley use the other boxes. Over all I do like it and less daily scooping.