I don't have the P9, but I have the CW9 which is the cheaper version. I've only put a couple of hundred rounds thru it, but have zero problems. Kahr recommends at least 200 rounds to break in. Have read on other sites that some have had problems during the breakin period, but they smooth out after that. The size is great for concealment and still has enough grip to shoot comfortably. The PM9 has a bit shorter barrel and shorter grip (better if you want to pocket carry). I really like it so far.
Jim