Just three weeks ago I bought the S&W M&P Shield 40. Haven't bought a holster for it yet, but it fits beautifully in the inside pocket of my Carhart.Smith & Wesson M&P 40C
Definitely packs a punch.
My 'other' carry gun is a full-size M&P 40. Little hard to conceal, but I can do it if I want to. Since I used to be 100% behind a desk at work, I never bothered to carry it; now I'm in the field about 3/4 of the time - hence the purchase of the shield.
When I'm hunting or just out for a walk in the woods, the full-size rides along in a Blackhawk Serpa paddle holster.