It's a story I have told many times.
Yes, first of all, the trigger really sucks. Not just that it's heavy, either, it feels like a rubber band which increases in weight and suddenly snaps. It's a workout just to fire the thing. At least a NY trigger is consistent.
My sigma wouldn't feed HP ammo. No problem, I'll have the feed ramp milled under warranty. Then the front sight fell out. (As in Ron White saying about the wheel on his van after having it serviced; "It fell off. It FELL OFF. IT FELL THE #^%$ OFF!") No problem, that's under warranty, and I wanted night sights anyway, right? Then, using Winchester Whitebox, I hat a failure to leave the barrel. The old muffled pop. Back to the gunsmith to have him pound out the bullet.
90% of the bad things I ever had happen to any gun happened with that BRAND NEW ONE in a 30 day span. I carry cards to hand out at gun shows to anyone I see looking at one. And the M&P might just be miraculously good, but you know what? Glock didn't need three different pistols to work the bugs out. S&W even copied the Glock so closely they got SUED and it's still not even close to the same quality. S&W autos are under Taurus, Keltec, and Makarov on my quality list. There are too many other good pistols in this competitive market for me to see myself picking another one up.
Enough details?