I was recently discussing on another forum that I was considering getting a .40. To be honest I dont have alot of experience with semi-auto. I've been shooting .357 mag revolvers for close to 20 years. To my surprise most of the folks acted like the .40 was useless. I kept being told eith 9mm or .45. Well I'm just looking for a little advice . I'm really not interested in getting a .45. The gun I have my eye on comes on either 9mm or .40. Is the .40 not a very decent round? Please forgive my ignorance. When I look on paper it looks good but I know paper and real life are 2 different things.