Picked one up, along with Kubota's little book, for my after hours security gig, in case I take a shift at a post where they don't want me wearing a duty belt, and just for stuffing in my jacket pocket for a non-lethal self-defense option.
Just curious whether any LEOs actually use these things.
As a self-defense tool, it seems like a convenient, nearly weightless item that would definitely multiply the force of a blow. That is, I can see how a civilian could want one to jab into an attacker's sensitive body part. The pain compliance techniques for LEOs, in the Kubota book, though, would seem to require a lot of practice to actually work in the real world and seem like they might be redundant to the tactics you guys must train on already.