I've been using Tidy Cat also, but I'm in the process of switching myself. My most recent purchase has been what I think is Petsmart's "house" brand. I don't remember the name of it but what I liked about it is that it comes in "unscented" form. I just can't stand all those perfumey ones they come up with so I can't imagine how T & P can handle it. Everytime I scoop I just about gag from perfumey smell that arises. Hard to believe, but I'd much rather smell a normal litter box smell than all that perfume. I have no idea how this stuff clumps up because I'm still using up the stinky Tidy Cat stuff, but I thought I'd give it a try.....