imported post
I use an M&P9 as my OC & winter CC gun. It is a very good gun--similar quality to XDs and Glocks, but with better ergos than either. The 3 different backstraps change both the size and the swell of the grip. It also has optional configurations (with/without manual safety, with/without mag disconnect) if you insist on those features. It was originally designed as a .40, so it's more-than-tough-enough as a 9mm.
Out of the box the trigger is about 6 pounds, give or take, and somewhat gritty. For about $65 you can have some smithing done or get an aftermarket kit that will significantly improve the trigger (better reset, shorter travel, cleaner break, and can reduce pull weight if you want). I've shot some before & after, and it's worth the $65.
Holster availability is good (though not great), as are aftermarket goodies like guide rod and CrimsonTrace laser sights, night sights, etc.
Sadly, my accuracy with the 4.25" M&P appears to be about the same as my 3" PT111. I attribute this to the tougher trigger pull (6.5 lb vs. 3.5 lb). Once I have my M&P trigger reworked (probably the Apex Tactical DCAEK kit), we'll see if my accuracy improves.
I'm perfectly comfortable using 9mm as a self-defense round, for a lot of reasons I won't go into here so as not to re-spark the timeless debate.
Bottom line: it's as good a mid-priced polymer-framed auto as you're likely to find.