I own a M&P40 Full Size and a Glock 26 Gen 4.
I use my Glock 26 Gen 4 day in and day out. Because of that I find less of a reason to need the M&P40. I like to simplify things and not have to purchase all different types of calibers. I wouldn't CC the M&P because of the size. I won't hunt with it. I don't like the grip to much because my hands sweat easily (for that the new rough grip on the Glock Gen4 works great for me).
Do I sell the firearm (M&P) or keep it for a reason unknown.