Originally Posted by paul34

It does have the drawback of needing contact, plus the effect is only valid as long as you're willing to keep contact, which doesn't make sense for a defense scenario.

I guess it works for prison guards or nightclub bouncers - basically, pain compliance, not so much pure defense. I guess its better than nothing but overall, doesn't seem like a great choice. Upside is that it is legal to carry in many areas. For example, I can carry one on my campus legally for self-defense.