I own 4 M&P autos and that little 9c has become one of my favorites to shoot. I use mine with the standard compact magazine with pinky extension for daily carry, but will regularly switch over to the full-size 9mm magazines and use a rubber sleeve called an X-Grip that gives you the feel of a full-size M&P9 grip. Simply one of the funnest guns I've shot, hands down. Incredibly reliable and accurate, never a problem and I've sweated on it, shot it until it was almost too hot to touch and it never missed a beat. I'm around that 1,000 - 1,500 round mark with mine and it's never ever had an issue. Mine is one with the thumb safety and the more I shoot mine with it, the more I like my M&Ps that have one.
I carry mine daily in a Raven Phantom OWB holster on an Ares Gear belt and unless I start doing cartwheels, it disappears under a long t-shirt. Only my M&P45 ranks higher on my list of favorite guns that I shoot on a regular basis.