I carry a 45 FS in a Milt Sparks Summer Special II IWB supported with a Milt Sparks belt. I can wear this pistol comfortably for more hours that I care to have shoes on my feet. It is a very comfortable rig. It offers nothing special in terms of being able to tuck a shirt in around it, but it holds the pistol tight against the body just behind the hip. Concealing a full sized M&P 45 is not much harder than a full sized 1911. Just remember that when you pay the extra money for the better leather, you get better "performance." Buying a trouser belt designed to support a handgun also aids in the concealment of the pistol. I know people with the Crossbreed holsters, and they are something to pay attention to. Not to knock the cheaper, or generic or mass produced products, but the custom leather will work better longer for most people.