I use aspen chips now, though I used pine shavings for three years before switching. (I didn't realize it could be toxic, so I stopped using it despite that it seemed to be causing no ill effects.) With a humid hide, my snakes don't have issues with bad sheds. Plus, it's easy to tell where they go to the bathroom, and I use a regular ol' pooper scooper when they do.

I think I like aspen shavings better than SaniChips, though. Some of my balls like to burrow, and it's pretty easy for them to get chips stuck in their mouths.