Just a quick note on my 9c. I picked it up last week, and finally got a chance to run up to the local indoor range. I ran about about a 125 rounds, and really liked it. I don't consider myself a real super accurate shooter, but impressed myself at about 30 ft out. I really am not a pistol guy either, almost exclusively revolver. Everything I own I shoot double action only, including my 4053 S&W. That being said, I really found no issues with this trigger at all, and it really never came to mind.
I shot 115 WW FMJ, and 124 WW Nato spec, and 115 Remington Hollow points. Several times I mixed all 3 in the same mag, with no problems. I pretty much shot it right out of the box. Pulled a bore snake thru the barrel, and threw drops of oil where S&W said to and off I went.
I like the size and weight loaded, tossed it into an inside jean jacket pocket, and it fit well.
Overall I had a lot of fun shooting it, and am convinced to go buy a full size also. Plus there is an ever increasing number of people working on and making add ons for the M&P, so there will be some cool things to do to the M&P if you like that stuff.