Ok - at first
I got one of these trays to try and save myself some work as I have 9 indoor cats and 10 litter trays. It performed as described, at first, although I found that, when topping it up, I needed to go through the remaining litter with a scoop to remove a few smaller lumps that escaped being filtered out. However, after a week of use, I noticed that the top part of the plastic filter grille, where it bends over to fit in the tray, started to crack, on the fold, at both ends, allowing clean litter to pass through into the drawer when it was rolled. This meant either losing a lot of unused litter when dumping the waste, or losing time scooping the waste out of the drawer to save the unused litter, and defeating the purpose of the tray. I have a replacement on the way, to see if this was a one-off fault, but if it develops the same fault, it will, unfortunately, have to be consigned to the dump which is less than ideal for a tray that cost the best part of €50.