Bopping somebody with one may be considered lethal force so you better know your stuff in your state before hitting someone in the head.
And indeed it is. There is the true ASP, and there's a bunch of counterfeits out there. The true ASP won't "rattle" without one hell of a lot of abuse. An ASP is like gun in that it takes training to use properly. We go through intense training every year, and every year, the day after, I feel like I've been beat up by the Dallas Cowboys. ASP makes 2'x2' thick foam shields for training, and you train, full impact, against multiple attackers. I don't know if there are any certified instructors out there for non-LE or not. I do think that the PR-24 is better as a defensive weapon though, while the ASP is better as an offensive one.