I bought three(3) and don't own one(1) that's a riddle.
I like them very much and I was a "pen guy" before knives, guns, audio or cars. So.... I think that says something.
I like the heavier grade Investigator Pens (SS, Brass, etc) the Aluminum are just as nice in every way just much lighter, so factor that in.
I have such confidence in Hinderer products that I say this from time to time to show I am willing to back my opinions - Buy it and if you don't like it PM me and I will buy it from you for what you paid (no loss to you, no risk)
Have not had anyone take me up on it yet
As for first impressions, they are on the small ish size but, for an EDC the size is nice and I say what I say about the XM18 3" - give it a week or two in the pocket before you finalize opinion.