I recently purchased a "tactical" pen offered by SureFire. It's their 1st generation of tac pen.
http://www.surefire.com/The-SureFire-PenI really bought the thing just because, in my mind, it can never hurt to have a little extra advantage over the bad guy. But the reasons for choosing this particular model was 1) It didn't have a cap that I could lose and 2) It is able to use several different refill cartridges.
Now I find myself wanting more tactical pens. It seems I have a psychological need to collect things I find 'cool' (AKA tac-ti-cool).
I would like to know if any of the DRTV forum members have acquired other brands and styles of tactical pens and their reasons for them. Before long, I think I will end up with one of everything but would like some personal experiences on each of them so I can get an idea of which order to buy them in.

I also have little doubt that these objects will soon be banned as well under the current administration because, as everyone knows, the pen is mightier then the sword.
BTW, the SCHMIDT easyFLOW 9000 cartridge that comes in the SureFire is an excellent writing pen.