I've had a 9c a few years. The only trouble I've had with it is bad ammo, otherwise it's like the Energizer Bunny, keeps going and going. I've read the complaints about the M&P trigger. Transitioning from a 1911, the trigger was a whole new ball game. Had nothing to compare the trigger with, just got used to it as is. My biggest problem is since I got a Shield, I don't carry the 9c all that much any more. That aside, I heartily recommend it.
Never argue with an idiot in public. People passing by won't know which one of you is the idiot.