I got the gray carefresh a long time ago when I got my chin. I read that it was best. I hated it. Chins aren't really dirty animals but it smelled within a few days. Since we had a good amount of cages, the lady I lived with at the time went and bought a big huge bag of kiln dried pine at a southern states for $6 I thnk. That would last a long time and was cheap, and the only thing Ih ad to do in return was clean and basically take care of her daughters hamster and guinea pigs. I didn't find it bad, with my 6 cages I had to clean, 2 more weren't that bad.
At the beginning of this year, my mouse had babies, and I decided to buy the carefresh because It hought it would be better than wood chips. The one thing I noticed and actually discouraged me more than price from buying it again was the dust on my pinkies. Plus at $10 for a small bag, I would use that in one cleaning of all my cages. The big bag really isn't that much more, and I bet I could use half of it filling the bottom of my rats cage. I bought aspen instead, and actually it does keep the smell down. (I forgot to mention that I bought the carefresh ultra).
The only carefresh I would buy now is the $5 bags of the pink carefresh for my neices mouse cage because she loves pink. She's going to have 2 females, so I don't think the smell will be too bad. I might even mix it with a little bit of aspen. I think carefresh is one of the worse beddings and I would ether stick to aspen or kiln dried pine. I can get a HUGE bag of aspen for $10 and at a farm supply store it'll probably be cheaper.