I use the Blackhawk Model #28 Askins Compact Concealment holster for all of my M&P's. I works great for concealed carry and is very convenient for open carry also. It keeps the pistol high and close to the body; out of the way while you are active. It has an adjustable retention screw, so you can crank in the amount of resistance required for the activity you are involved in. It's my favorite holster, followed by the Blackhawk Cover Six model.
I guess you could say I was hung up on Blackhawk holsters. I used to carry pistols exclusively in thumb break holsters and never got into any of the kydex/serpa types. A comment by Sheriff Jim Wilson, in Shooting Times magazine, stating that thumb breaks were just one more thing to think about in a high pressure, life and death situation. That put an end to my thumb break holsters. I now have a box full of them in my closet, that I never use!