No experience with the CM9, but I've had a PM9 for over 6 years and I love it.
The PM9 and a CW45 are my two CCW guns, with the PM9 being carried about 75% of the time. I have no complaints and will enthusiastically sing the praises of both those pieces.
Build a man a fire and he'll be warm for a day.
Set a man on fire and he'll be warm the rest of his life.