Instead of DC:15 allowing a skilled Tumbler to pass through attackers without suffering Attacks of Oppurtunity, would DC = Attacker's "To-Hit" (BAB + STR + 1D20 + Enhancement Bonus + whatever) be better?
- Yes! Fighters would be the best, and it scales with level!
- No! That's worse than DC:15!
- Bleh! They're about the same!