It seemed like a good idea, but it just doesn't work as is and needs a lot of re-engineering. Where ever you place the litter trays down, they will leave a lot of small litter particles. You need an extra solid bottom trap to place the trays down on. You can't fill with as much litter as they instruct, and it goes all over the place and makes a mess. There are no negative reviews on Luuup's site! Fraud? DON'T PURCHASE!
Bottom Line: No, I would not recommend this to a friend