In my experience overdraws were used by people with long draw lengths who wanted to shoot a shorter shaft and get more speed and a flatter trajectory. I use to use one myself but switched to carbon shafts years ago and never looked back. Although overdraws do allow the shooting of a shorter shaft with todays carbons i think they lost some of their attraction. With carbons a person can shoot a full length shaft without losing the speed thats gained from shooting a short aluminium shaft. I also think that with an overdraw there' s not much room for error when it comes to your shooting form. I' ll admit that if i still shot aluminium shafts i would probably still have one on my bow but with the carbons i see no need for it.