Tempest,
What a nice review! I've been using the SF pen as well now for three days and it does impress me as a pen that will last several years of EDCing.
I would like to ad someting to your review. IMHO the clip being so secure comes from the fact that it is a thick heavy stainless steel clip,
that has so much spring action into it, that when it is clipped over tick jeans-fabric it doesn't bend open. It slides on easily enough through the spring
action, but also holds tightly. And not because there are barbs on the back of the clip to damage your shirt or pants, it is just because of the spring action.
Did I mention spring action?

But this thing is one hell of a pen and I'm planning on using it like my titanium McLaren West ballpoint that lasted over 6 years before wearing out
the plastic internals. I could perhaps get some new internals in, but I opted for the SureFire Pen.
Be warned, using Surefire could lead to another addiction. I've got two flashlights from them, an EP500 headset for my mobile and also
a ballpoint. But, it is not like FP's you collect: the SF's will be used and will stand up the abuse of EDCing!