The trend now seems to be: 9x19mm &45ACP in the compact frames. When I go to the range to practice, 45cal. and 9mm along with 22LR of course, are mostly what I see shooters using for practice.
I shoot .40S&W along with .380 and 9mm., but I don't see many others shooting 40's. Mine is an SD40ve and I love the way it performs. I had a very long, hard time getting used to it's recoil and bark! It was my first hand gun. I took it to an outdoor range when i first aquired it, shoot 4- rounds and said, Enough of this. It really scared the bejeepers out of me!
Later I took it to my local indoor range, got some instruction and pointers on it and now all's well. I've shot over 1,250 rds. with it and I find it qiute easy to shoot. I keep it for my HD weapon. I have the Shield9 & a BG380 to use as CCW, but I think the 40sd is a little too large to consider for CC. Just MHO.