I guess it's time to come out of Lurker status and contribute something. Even if the subject (Glock)is relatively new to me.
Not that I was unaware of them, but I had a mis-conception of what it was like to actually use one.
I started shooting in 1946 and never completely stopped. Mostly target, but also hunting as far away as the Kenai Peninsula in Ak.
Recently my son-in-law gave me an awesome birthday present. He contacted a Glock dealer here and set up a purchase for me. Any Glock of my choice, including all fees paid.
Not too long before, I had the good fortune to participate in an exercise at Fort Bragg, NC. It included range-firing several Special Forces weapons. I had never held a Glock in my hands before, and I fell in love with the Glock 19 on the spot.
My mis-conception was that firing a hammerless pistol like a Glock would be similar to firing a double-action revolver or automatic from a hammer-down position. Long travel and high-effort. Obviously I was wrong, and the groups I shot with it backed that up.
Thus, the 19 was on my "want" list until my son-in-law solved it.
He knew that I had many years of firing .357 and .44 magnums, so he suggested that I consider the more powerful .40 rather than the 9mm. He is well qualified to that, due to many years in SF.
I finally chose the Model 27. I hated to give up the rail for the exotic sights, but concealability was more important to me. Magazine extensions give a full-size grip when wanted, and it is still accurate without extensions.
I was surprised when I took it to the range and it shot as well as the 19 did for me. Happy is an understatement.