I owned a series of older M&P9's that I really liked, but I had persistent problems with accuracy from their barrels. I would get wide groups, perhaps twice the group size I am able to achieve with other pistols -- say 6" groups at 21 feet instead of 2-3" groupings. That's just a personal benchmark, but I struggled a long time with those earlier M&Ps, added Apex triggers, tried different ammo, handloaded different bullets, etc., and never could find a specific ammo loading that really worked well.

Those pistols all came before 2012, which is when I believe the M&P switched to the 1:10 twist rate.

I would not buy a 2009 unless I had a spare Apex barrel to fit to the gun.

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S&W Rover