I was highly skeptical. However the Scoopfree litter box does indeed clean the litter box, eliminates odors, and in general keeps things much tidier. Sensors detect when a cat enters. At a predetermined time after the cat exits the box, it automatically rakes the litter into a closed compartment, eliminating smell and the need to scoop. It uses disposable litter boxes with crystals that absorb urine (and don’t get tracked all over the house.) With multiple cats, one disposable litter box lasts at least a week. With one cat it will last for several weeks. It even has an occupancy meter so you know how many times it has been used.
Best of all, our cats immediately prefered Scoopfree to traditional litter boxes.