I assume right from the get go that most r going to say go with the 23, because most guys tend to favor as much power as they can get their hands on. I've always been a big fan of the 9mm, and from the little experience i've had with .40 s&w i find them just unpleasant to shoot. i feel 9mm is enough power to do what it needs to do in cc situations, but i have to admit, i've been being tempted by the allure of more power lately. i've shot a s&w .40 cal and a sig 226 equinox in .40 as well, and to my surprise, even the sig had considerable snap to it compared to even my little kahr pm9. i would imagine glock's gen 4 dual recoil spring to help that tho. anyone shot both that could give me a comparison? also, my brother says his glock 30 kicks less than a .40... anyone heard release dates on a glock 30 gen 4? would that b worth waiting for instead?