Just bought a PM9 and fired 300+ rounds the first range session. Several function issues during the first 50-100 rounds. Got better as the rounds added up. As I approached 300-ish rounds function issues went away.
As for the shooting impressions. I fired about 200 rds of 124 gr fmj and then about 100 rds of 115 gr GoldDot. The best description is snappy recoil. Not really bad, but not comfortable either. I had a titanium S&W 342 in the past. When shooting +p .38 ammo, it was NOT comfortable, in fact it was painful. The PM9 with standard 9mm I've fired thus far was not that bad, but I wouldn't want to shoot a couple hundred rounds every week or two, but I expect to shoot maybe 50 rounds every couple weeks to further break-in and get used to the feel.
Trigger pull is long, smooth and what a Glock trigger should be, IMO. Accuracy was so-so. When shooting @ 15 yards standing, I could place all rounds on a 8" paper plate if I took my time. However, I wouldn't expect to engage a target at 15yards with this gun unless I absolutely had to. I forsee this as a very close in weapon. In that regard, I think it will excel.
Having also owned baby-Glocks, this gun is MUCH more concealable. Thinner and smaller in every direction. I always wanted the Glock 26/27 to be my goto CCW gun, but it was sooooo chunky....the PM9 is perfectly sized for this role......IWB, ankle carry, etc..
Anyway, my impresions.