I have a M&P 9c with about to 6-7 thousand rounds including Winchester White Box and CCI Blazer brass and aluminum, Remmington UMC and some range reloads and some good "carry" hollow point ammo too, and I have not had a fail to fire, feed, or eject. No jams or stovepipes. The pistol does what it is supposed to do. I also have a M&P .357 sig full size with about 1250 rounds thru it and nary a problem.
Hope you have better luck.