I have his and her''s 9c's, 5" Pros and 5" CORES. All but one post 2013. Interestingly enough the worst trigger was on the 2016 Performance Center Ported CORE. The trigger pull was about 1.5 lbs over the advertised trigger pull weight and very gritty (plus the usual pre travel). It did have a nice reset though.. When I called S&W to talk to them about the trigger pull, they told me to just shoot it for about 500 rounds and then call them. IMO if a gun is advertised as having an X trigger pull, it should have said trigger pull. Well 600 rounds later, the trigger pull was lighter, not to advertised weight yet though. The grit was better, but still there. Since I will prob. compete with the gun in the Carry Optics division (with an Apex barrel) I did not go the full Apex route with it (like all my other M&Ps after being shot for awhile). I ended up replacing the sear and sear spring, the trigger return spring and striker spring with Apex parts. I also have put in an Apex barrel since I hated how dirty the Smith barrel was. I now have a much nicer trigger pull (at 3 lbs) and it feels great. My 2 9c's have the Apex DCAEK kits in them with Apex triggers and the 2 5" Pros both have the FSS kits in them. We compete with all the guns except the 9c's so the trigger is important to us. Coming from a 1911 background, the stock triggers where horrible. but Apex parts made them tons better, especially the FSS kit.
I agree with others though, if you decide to get an M&P, fire it for around 500 rounds and get to know the gun before you decide to change it. Many people love the gun stock, just as many love it modified. It all depends on how you shoot it (competition, plinking, home defense, etc.).