Look and feel
First off, let's take a look at the outside of this pen. At arm's length, you might think this pen is made of metal sporting a matte black finish of some kind. Well, you'd be wrong. It's actually a well-done plastic that looks tactical, but doesn't deliver. The knurling on the grip is a great feature and I'm surprised it feels as good as it does, only because of the material.
It's a very lightweight pen, which is good and bad. It's good because it makes writing very comfortable, and it doesn't weigh down in your pockets. It's bad because it's not durable.
Pressurized special-use pens usually have a pretty sturdy body because they're meant to be used in environments not normally intended for writing instruments. Maybe we should call this category "off-desk writing instruments" (my pitiful attempt to draw an anology to off-road vehicles). Either way, you might be able to write in a harsh environment, but it wouldn't survive if it was run over by a lunar rover. And, let's face it, if you're writing on the moon, that's probably not an uncommon risk.
Kidding aside, I do wish the body was more sturdy. Really, if it was the same design but with a metal material, it would be several notches higher in my book.
The clip has a really satisfying "chunk" when you click it, and it also releases when you lift the clip. This will save any of us who unwittingly put open pens in our pockets.
The model I have is black, but you can also get other colors.