Billy Ray, I'm assuming that you were asking me about the Comtech Stingers. I like them just fine. They're sturdy, light and leave quite a dent in wooden beams, metal folding chairs and the like. I've been told they leave quite a dent in the skull too, LOL.
The Stingers are pretty simple. They augment whatever skills you may already have. They align the fist properly, and can be used in a number of applications, from pain compliance to a full on fracus.
They are also extremely popular, I initially purchased three, and everyone in my office wanted one, and several wanted some to give to friends and loved ones. I wound up placing a second order for 40. There are a number of suppliers, but I'd recommend going to the source:
Comtech . You'll find Stingers as well as a number of very good tapes on knife combat and other related matters.
Hope this covers all the info you were looking for. If you've got more questions, check my profile and drop me an e-mail.
Zzzen_Dog
Oops, almost forgot, they fit quite nicely in a pocket, though I'd attach a lanyard for ease of access. Also my color preferences are black, then clear. Not much for blue and green.