I love my CM9, and didn't experience any of the problems that I've read about.
I do have one question for other P/CM9 owners... I didn't notice when I got it, but it looks like the polymer frame under the barrel (dust cover) is "swelled" out a little bit. I really wish I had paid more attention to that before I took it out to the range. It doesn't seem to affect function, and the guide rails inside the frame seem to engage the slide properly. Is that the way it came, or is it new?
Also, there appears to be a gap between the slide and the frame behind the muzzle. It's enough that I can clearly see light through it.