I have one of the Smith & Wesson tactical pens, too - I keep it in my EDC bag. I really like it as a writing instrument - it takes Parker pen refills, and you can get the rollerball refills, which I really like writing with. I really like the sturdiness of the pen, and it is very well machined. It is my every day use pen, and men often comment on how much they like it, when they see it.
I also own a Benchmade tactical pen, an 1100 model with the blue anodized pen grip, which is a superb writing instrument. It takes Fisher space pen refills, so it will write even on an airplane, or upside down. The model I have has a carbide tip for a glass breaker/spike. I like the precision crafting of the knurling on the anodized aluminum, and people love the way it writes. They never realize that it could be used in self-defense; they just think it is a real nice pen. I got a great deal on it from my gun dealer, who sold it to me at his cost. Awesome pen.
http://www.benchmade.com/products/1100
I think these are very valuable to the prepper community. The pens serve multiple purposes - it is a nice pen, it can serve as a punch to allow you to escape being trapped inside a vehicle, it doubles as an impact and self-defense weapon, and in a pinch, it could also be used as a pry tool or lever in the same way a metal spike could; you could even chip ice or dig dirt with it.