I gave 5 stars because i've had three Litter Maids over about 12-13 years and have always been very grateful not to have to clean the catbox--i was able to forget about it for at least a couple of weeks at a time, sometimes much more. I have only one small cat.  You can't beat not having to think about the catbox, it's almost like not having one at all--compared to the old fashion litter box.