The long catch box does not catch all the litter clumps when you roll it over. Wet letter sticks to the screen at the bottom and does not go into the little box. The whole litter box is too big. It is hard to line up the top of the box with the bottom to latch the latches on the sides. I have a regular litter box with a top which is much easier to clean. I would not have bought this litter box if I had known this beforehand.