I bought a FS M&P9 at Christmas. The trigger was garbage. I compared it in the store to an XD mod 2 and a Glock 17. Both the XD and Glock had better triggers, with the XD being better than the Glock. The XD was almost as good in ergonomics. The Glock felt like a 2x4. Out of the box, I couldn't hit the side of a barn with my M&P unless shooting from a bench. After about 1000 rounds (and probably 2x to 3x as many dry fires), the trigger has improved a lot, and I've learned better trigger control. I'm fairly accurate with it now. The trigger is better now than a new Glock, and about equal to a new XD. I don't have access to broken in Glocks and XDs, so I don't know if they would have experienced similar improvements.
I bought it for IDPA. At the last match, in my squad of 8, there were 5 striker guns, all of them M&Ps (I need to start putting my initials on my mags). Zero Glocks, XDs, or VP9's. At a safety station, I DID see a Glock, so the other squad had at least 1. Back in Feb, at my first IDPA match, I had the only M&P among a sea of Glocks and 1911's. It looks like the M&Ps are making inroads on Glock's stronghold on IDPA. S&W is probably working on something new, but right now, they'd be stupid to replace the M&P line. Even if they had a new design ready to roll out, from a profit standpoint, they would not do so until sales on M&Ps started declining.