Obviously, I'm a 9mm guy and have 3 already. One reason I've stayed with 9mm in carry pistols is I try and keep all calibers to a minimum (9mm, .357, .45) to make reloading and ammo collection easier. I have 3 - 9mm, 3 - .357,& 1 - .45. And, I am regularly given quality 9mm ammo so practice is free. So why would I really need/want to move to .40 ? I ask, cuz I see a super nice .40 on here that would fit my need on a new gun search, but am just hesitant to add this ODD caliber to my collection, thus making me have ANOTHER different ammo box to keep full.