It will work with both of your Glocks. I use one. It has held up well, but I was putting in on and taking it off a LOT over a long period of time. Now the front snap sticks somewhat. I may have bent the snap. At any rate, it still works great as a belt slide holster. The pistol is easy to draw, but it is very secure.
I had 3 people in a class this weekend and all were shooting G26 9MM's, by 650 rounds all had tape, blisters, and were just really tired. If you have a sub-compact and a larger gun of the same caliber (G26/17 or G27/G22) it maybe a good idea to bring them both. It will definitely help the hands.