Fobus puts the gun a lot closer to the body for retention. It is not a complete holster, in my opinion. The Gvt. slide sticks out about an inch. It is a very quick rig, though, for slap-on purposes. I have one, and will only keep one. Fobus are made from cheap PVC.
Uncle Mike's belt holster is a fantastic buy at $17 or so. It is not a concealment hoslter. The holster pulls the grip away from the body. The quality of Kydex is very nice and thick. It is great for open carry, and range draws. I like the paddle version, also, but it still does not pull the gun to the body as closely as the Fobus. I think they are worth buying to fool around, but for true concealment and retention of a 1911, I recommend an Avenger style loop and slot design.