Supurrb
The mat is excellently designed. It's trapped a handful of litter in the first couple of days it's been in use and very little has ended up on the carpet. My cat willingly walks over the mat without trying to avoid it; she even lies down on it from time to time.
The plastic grid, whose slats have a smooth rounded shape on the top making them very gentle on the paw, lifts out easily so the bottom tray can be emptied. I find it's mostly dry, clean litter granules that end up in there, so I just throw them back into the litter box.
Total success; very happy with the purrchase.