There is no better drill to demonstrate how little time you have in a self-defense situation.
Yep. Just don't ask a former NFL linebacker to role-play the aggressor. It hurts
The interesting thing about the Tueller drill is that, even if I know the assailant is coming, he's physically on top of me by the time the muzzle's up, and it's usually touching his stomach or chest. If I wasn't expecting it, things would be different. This goes a long way to demonstrating the need for some degree of hand-to-hand training as well.