Anyone own them? They seem to be about the most effective weapon I'm allowed to carry on campus, and with a number of robberies, muggings and just bullshit beatings, I'd like to have something. Mace would probably end up hurting me because I'm asthmatic, and it would honestly probably put me in the hospital. There are a few sites I see them for 10-20 bucks. I know not to get the belt buckles, but any suggestions?