Is anyone using or has used any of the "tactical pens" available? I was looking at the Benchmade, Timberline and Mil-Tac. Any feedback? They all seem available at roughly the same price. My primary requirement is that it must be comfortable to write with. Second, it has to fit in a standard uniform shirt pocket, so no Cold Steel Sharpies for me. Are there any others out there, or which have you used and find comfortable to write with? Thanks in advance.