This is a great invention...no more scooping daily, much less smell, much less mess.  We have one cat & empty the recepticle weekly.  Yeah, the poop stinks when the recepticle is in the trash, but duh, it's cat poop!  Take the trash out.  The litter does stick to the rake but not enough to stink or really accumulate.  We did have the cat tent also, but it didn't really improve smell & didn't seem to ever fit right.