If you have a 20 ponder like mine don't bother. For the normal size cats (<12lbs) it works great, I used "Fresh Step" litter and tosed the litter tray every 2 or three fills. You can adjust the time between your cat using it and when it scoops so that the litter can fully clump.
My huge grey guy would always point his head to the back of the box and pee into the front. This would create a cement style mixture right where the litter meets the front edge of the pan. This would usually jam the blades. When he went to a sitter and we just had the two smaller cats it worked fine.
My huge grey guy would always point his head to the back of the box and pee into the front. This would create a cement style mixture right where the litter meets the front edge of the pan. This would usually jam the blades. When he went to a sitter and we just had the two smaller cats it worked fine.