I will try to be very humble in this post.....my m&p 9 was the worst purchase I bought in a handgun....I got a lemon.
Basically in a nutshell:
1.) bought pistol beginning of August
2.) went to shoot it, had multiple FTF's and slide stop broke
3.) sent it in
4.) got it back 5 weeks later with a free mag
5.) went to shoot it again
6.) slide stop was fixed, but even more FTF's
7.) barrel had excessive penning on the left side and there were some chip marks near the feedramp and rails seemed to be "grinding" heavily - hard to rack and chamber
8.) sold it and bought a CZ 75 Compact
9.) couldn't have been happier
Not to 'diss any people who own them, I got a lemon. But I will never invest in them again.