As I've mentioned in other threads, I've had 2 PM9's. My first one was used, and I had no troubles with it. I don't know how many rounds were thru it when I got the thing, or if it ever made a trip back to Kahr. But it was totally reliable for me.
My second (I sold off the first and missed it) has also been totally reliable, save one FTE the other day. I was running some light-ish reloads thru the gun, and out of 50 I had one FTE. The empty case kinda wedged in the small port. Tap-rack-and I was bangin' again. PM9's are known to like hotter ammo, and so I expect it to keep running 100% with normal to hot ammo. I have ~650 rounds thru this one, 173 of them GDHP +P and the rest "regular" ball.
Great guns, these things. Fun to shoot, and I'm a little more accurate with them than snubbies. I really have to stick to the practice with a snub to be a good shot with it, whereas the PM9 just rails as a defensive handgun. Target shooting won't impress you, but in fast fire it hits just where you want it. And it's probably the most comfortable IWB gun I've ever tried on. I do pocket carry at times, but I prefer belt carry, so do that more often.
Anyway, love this little thing. I'm NOT selling this one.