Used to carry a Glock 27 before I lost my job and needed the $450... I think the S&W .40 is the perfect round for a carry weapon. Hell I think it's the perfect round for any type of self defense situation. Not too much kick but plenty of stopping power for the poor schmuck who chooses to endanger me, my family, or my property...
I prefer and mostly carry a 45, and now since I have added a sub-compact 9 to the family I carry it as well on occasion, but regardless of either of those two that I am carrying at the time you can bet you tail that I have my 38 on me also.