Sitting here now with my Glock 19 (Gen 3) on my hip in a comfortable Crossbreed SuperTuck. I often forget I am wearing it. It took me a while to adapt to the trigger system from my Kimbers, but this is a damn fine gun and aims as well as the Kimbers. The trigger is NOT a Kimber trigger, but with practice, it is fine. The weight/firepower/concealability tradeoffs have made me a convert.
As a new Glock owner, I went for the Gen 3. No regrets.