I don't like it.

I use KayKob by Kaytee.
I've tried the same kind, and after two days the litter would be moldy. Not to mention smelly :S Having to clean the cage every two days was irritating, and the corn cob made the rats smell which meant more baths for them.

I've so far tried corn cob, timothy hay, aspen moss, pinnicle pellets, clumping litter, and I think that's all...( I used pine when I first got Frisco and didn't know it was bad >_<)

The only thing that I like so far, is aspen shavings. I hated the moss, I thought it stunk lol. It's just my opinion though, I know alot of people who don't like it Give everything a try, that'a what I did. See what you like best before deciding on anything.