I have test fired the Shield in 9mm and absolutely love the gun. The local gun shop has one in .40cal that I can buy tomorrow if I want. I put a deposit down on a 9mm. If I want the 9mm it will be a two month wait. My two questions are 1. For those who have fired both, how much snappier is the .40cal? 2. Should I get the .40cal or wait for the 9mm. Thanks for your thoughts and advice.