Just had a local Glock rep come to my PD's range and introduce the system and let us shoot the G22 and G17. I have to say I really like the changes. The backstraps change the grip 1/8" smaller or larger than the standard grip. The RTF was a nice addition too. I always had to use a Hogue grip on my G22 when I shot it. The mag release seems much easier to access too. We have an injured officer who has one hand immobilized and was able to manipulate the gun very well. Overall I'm very impressed. IF I were still shooting a Glock on duty I would definitely make the change to the Gen 4.