A M&P 9c is easy to conceal. The 45c is slightly larger. The crossbreed style holsters make a world of difference. I have carried four different guns in them and while new to this art I had some difficulties getting comfortable. Once I found the sweet spot for my body shape, it's easy now. I like mine at 3:30. With my Beltman belt and a pair of pants one size bigger, and the holster adjusted to the proper cant and the gun riding at the proper height, the butt of the gun is pulled snug against my body and it doesn't interfere with the natural hinge of my hips. This position works great when in my truck, sitting at my desk, and walking around. I can even crawl on the couch and curl up with my legs under me to watch a movie.

It really comes down to getting the gun exactly where it needs to be on your body to fit your shape. Some holsters are adjustable, but those that aren't are a **** shoot for your use. While one guy says the Milt Sparks is the perfect holster, the next guy make be thinner or thicker and it may not work at all for him. Hence the drawer full of holsters and the hundreds of manufacturers!