As for shooting, just a super gun. Reliable and accurate and shoots to POA. No malfunctions in over 500 rounds of factory Ball and JHP. Recoil milder than Glock 30/36.
As a CCW, short butt is appreciated, and still has plenty of slide and sight radius for easier carry/shooting. Grip adjusts nicely to use preference, a little stipling - on the removeable backstrap only - with a soldering tip gives a solid grip without abrading clothing or hanging up.
Downside #1: Pistol has limited popularity and holsters are hard to find from mainstream makers in any kind of decent selection, BUT it will fit in the fullsize M&P40 or M&P9 holsters (without thumb-break) with a bit of stretching and wet moulding.
Downside #2: Compared to the svelte 1911, it is chunky and fat for an 8-shot .45 ACP. If you want to carry IWB, better be a size 36 or under waist. Spare mags are fat to carry as well, although if you are putting up with that thickness you can use the 10-shot M&P45 mags as spares (of course they protrude from the grip when seated).