Votes "sometimes" because out of all my snakes only four are on aspen. One is my corn who's my display snake and the others are my three biggest BP girl who I switched to see if their feeding improved (maybe being able to burrow would give them the extra security: they've been pigs lately but I don't think that's totally due to the substrate switch). The BPs have digested some aspen but nothing to worry about and I haven't had any problems. Everyone else is on paper towel/newspaper for convenience, I do prefer to NOT feed on aspen/loose substrate.