I know alot of people that use it with no problems.
I used to use it, but I stop using it for the following reasons.
1. I had a problem with small snakes trying to eat it during feeding time (at their small size, they would die when the litter expands).
2. When feeding one of my adult pythons on it, he got a peace of litter stuck on the top of his mouth, it then got stuck in his nose, which caused him to breath with his mouth open all the time.
3. I had to many problems with snakes having bad sheds, the litter seemed to dry out their skin and I had to spray them all down regularly to keep their humidity up.