I have mine for about a year, maybe slightly longer and I love it.
I have over 1000 rounds through it and it functions 100% and is very accurate, much more so then me.
The only problem I have had was my doing and in no way a function of the gun.
I have the model with no mag safety or thumb safety.
As far as holsters go, it fits the same holster as the Glock 21 so finding them is not an issue. You can't go wrong with a M&P.
I have owned a Sig 220 and still own a Colt 1911 but I shoot my M&P.