I really dont see the point to them. Besides pinching the hell out of your hand during reloads, and in some cases, while shooting, and making the gun unnecessarily bigger, they really dont make the gun any more shootable, and for me, actually less shootable. No matter what or how I tried, I could never get more than 11 in the mag with the +2 extensions either.
Once you get used to your pinky being under the gun, they feel quite natural, and are very easily controlled and shot.