Re: S&W M&P40C
I have an M&P 40C, overall I like it & have no complaints. I typically carry it with the magazine that has the extra finger extension, I do not shoot it well with out it.
As for the comfort of carry, I use a Desantis pancake holster, I can wear it all day and forget it's even there.
Before I bought it I compared it to the shield, and you really didn't gain anything concealabillity with the shield wit the exception of it's a tiny bit slimmer.
In the reliability department - I haven't had a hiccup. It feeds Federal HST's like a dream and any other target ammo I feed it. Very well made, solid firearm that fits very well.