Hi,
I picked up a M&P9 full size and the trigger is fine. Out of box, it had a little bit of grit in the take up, but once you hit the wall it was very nice.
I polished the trigger bar where it contacts the striker block until it was shiny and applied some grease and the take up grit is much better.
I put 80 rounds through it at the range and I did slightly better than my Glock 19 accuracy wise so I'm not making any changes to the trigger. It is a great shooter.
Good luck,
Alan