The holes in the scoop are too big. The wet, clumping litter falls through and "contaminates" the clean litter. The roll of bags that came with it and is supposed to sit in the bottom, so you automatically get a new bag when the used one is removed, doesn't fit – it's too wide and can't turn at all. Big disappointment – waste of money.
The holes are too big, the top part moves, and the clean sand goes into the bag. If you want to clean the sand, everything ends up in the bag. I went back to the classic one after a day and this ended up in the bin.