I bought on for myself and one as a gift. Thought it would fit in my flight suit pen pocket, but it's too fat. Not a big deal. The pen works most of the time, but I have had problems getting it to write, so 4 out of 5 stars for that. The "striker" feature is not actually a striker FYI, but it IS magnesium which is cool and if you have matches is way more helpful then a striker anyway. Because magnesium burns so hot it can start a fire on wet wood etc. All other features work great, that I have tested, because I haven't actually used it for self defense. I have received many great compliments on it and people are impressed and jealous. And you really can't beat the price.
Pros: Tactical pen w lots of features
Cons: Pen ink is so so, not actually a striker
This review was written in the old system and had content requirements that are different than reviews written today.