I served 4 years as a US Marine and Pistol qualified once a year. I also have owned a few full size pistols. However I never carried concealed which is what this post was about. Most of the pistols I have shot were all full size, and at the time I never thought about concealing any of them.
Now onto the LEO carrying Glocks. Its all about the money baby. Most departments carry them because of ease of use (pull and shoot), most departments order them because they have a contract through Glock and get a good deal on ordering them.
Glock got a big jump ahead when the whole torture test thing happened. Of course Glocks are awesome machines and work very well under the conditions that alot of them see in the Law Enforcement side.
In my area the only LEO's that still carry Glocks are the new cops who are issued one, and the ones who have to carry them(due to their department). On the other hand, the Three County's around me, most of the sheriffs carry a 1911 style pistol.
Onto easy mastering of a newbie. The response is harsh, for example I believe that anyone who buys a pistol and doesnt train on it before carrying it; is a IDIOT, plain and simple. If I buy a 1911, I will read all the info I can and practice for at least a month on it before I begin to carry it for everyday defense.
Also with how much I shoot Rifles and Shotguns, I already have the mindset of safety off, then shoot, so a transition to a 1911 probably wont effect me as much as someone else...