I've got an M&P 40. I broke it in with a few boxes of FMJ then went to my hand loads. Worked great. I carry it on a Black Hawk Serpa Paddle. It comes with the paddle or an attachment to run through your belt if you prefer that, which I do. When you reach for it, your trigger finger naturally rests on the release button and it comes out like butter. If someone else reached for it, they would have to rip your belt off to get it. I liked it enough to go get one for my 1911 and a P-95 I sometimes carry, they're worth taking a look at if you carry on your hip. Security wise, for a hip holster, there isn't a whole lot better IMO. I've also got a couple shoulder rigs and to be honest, unless you're carrying an LC-9 or something similar in size, they're bulky and uncomfortable. I've never liked the idea of shoving a gun down my pants aimed directly at the family jewels, similarly the idea of blue steel in my butt crack doesn't really appeal either. Both situations can make it uncomfortable to do everyday things, like getting in your car or sitting down at a table.
I usually carry a smaller gun, a Ruger LC-9, in the summer because it's easier to conceal on the hip in shorts and a tee shirt if need be and the untrained or unobservant eye would automatically dismiss the bulk under my shirt as a cell phone clipped to my belt without even thinking about it. When the weather cools down and bulkier coats hoodies come out, I usually will switch to the .40 or the 1911.
Brings up an interesting question, how do you carry and where? Do you have different set ups or guns for different situations, seasons, ect? My wifes got it pretty easy with her carry purse!