Oooh! Forgot to add:
Kahrs still seem to require a bit of old-school break-in, even today. Their Owner's Manual recommends ~200 rounds for break-in before assessing for truly reliable operation, and many owners have reported that this is accurate.
I can't say this for-sure, as my PM9 was purchased second-hand from a gentleman who'd already put about 300 rounds on it.
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For any smaller handgun, my recommendation has been and always will be for the potential buyer to try to get his/her hands on it for some live-fire testing prior to making the purchase. For as much as "fit" is crucial to factors such as natural-point-of-aim and felt-recoil for a bigger gun, it becomes all that much more magnified, ironically as the gun gets smaller in one's hands.
When I looked to purchase a Sub-Compact single-stack 9, really the only players in the game were the PM9 (and MK9) and the Kel-Tec PF-9. I took both the PM9 and the PF-9 to the range, and the PM9 was noticeably *less* work for me to shoot, versus the PF-9, and that's what I based my purchase off of.
Years later, my buddy got a Glock 43 that he at the time wasn't so fond of - I picked it up and absolutely loved it. This, versus my experience with the just-as, if not more, popular S&W M&P Shield.