I love the 1911a1. I learned to shoot handguns, using a 1911a1. I shot competition in the military using an accurized 1911a1. I was a military range master, instructing Navy pilots on the care and feeding of the 1911a1. I've owned 3, but now I own only one. I got the Springfield GI for nostalgia, but chose the 4 inch version so I could carry it a bit easier.
I don't carry it often, preferring the S&W da/sa system, and carry a S&W 457, in .45acp. Why? After the Navy and in my police career, I carried S&W for 30+ years. I can operate them in my sleep. It is second nature for me. My fear is that I may fumble the thumb safety on a 1911a1 in a stress shooting situation. Old dog, new tricks? Perhaps, but hey it's still a .45. 8)
(http://i204.photobucket.com/albums/bb294/pioneer461/Guns%20-%20Pistols/Pistols08008-1.jpg)