I have a pm9, a cm40, and a pm40. So far my experience with Kahr has been spotty. The pm9 feeds great, no reliability issues at all. The cm40 runs fine so far, just barely broken in though; since she won't feed my cast reloads very well she doesn't get a lot of range time. My pm40 has problems.
There are a lot of people out there that malign the Kahr cm and pm line, and there are a lot of horror stories out there about people having slide-locking issues with them, and so-on. As far as slide locking and most reliability issues; the problem seems to be a small spring that people easily mis-align when reassembling the slide stop into the pistol, which impedes on the slide stop and causes problems. Given the idiot proof nature of most newer gun designs, this seems to be easily missed by most people and apparently is the cause of much grief at the Kahr repair center.
I picked up my pm40 for $300, with the caveat that it had the above mentioned issues....mostly premature slide locking open. I disassembled and reassembled with the spring oriented correctly, now the slide stop functions correctly, and the gun feeds factory HP's, but won't chamber them...might be that "match grade" (I don't know why, it's only 3") barrel. So I've got some more trouble shooting to do, but once I get it straightened out I feel it will be a reliable pistol. For the $700 MSRP for a pm9 or pm40, I so far have been extremely unimpressed with the value of the PM series over the CM series.