I've owned a Glock 17, Springfield XD9, Ruger LC9, Bersa Thunder 380 and I have just purchased a new M&P 9c. Each one of these guns is different and each is good in its own way. My M&P 9c feels great, shoots great, accepts full size double stack M&P 9 magazines and is a quality pistol. I've had one problem with it and I've had to send it back to S&W twice for the original repair. The problem is ejecting brass to my face and head ("BTF"). S&W replaced the barrel, test fired it and sent it back to me, saying that it is fixed. I notified S&W who immediately sent me another free shipping label for FedEx to pick it up at my house, just like they did the first time. They were extremely polite and did not contest my complaint. So far, so good.
I'm not giving up on them yet because I really like the double stack compact pistol. I should have it back soon -- total turn around time is almost 3 weeks. It has a lifetime warranty, so I'm sure that S&W will make it right. The only problem is, I'm postponing any future purchases of any S&W product until this is resolved.