The advantage isn't with the speed(or lack of), the advantage is from these being a very wide shaft (26/64" outside diameter) and that allows me to cut lines much easier and get a few extra X's or 10 rings that a skinny shaft typically wouldn't get. Being heavy is just a caracteristic of being a wide shaft. I also include 150 grain glue in points because they seem to shoot better for some reason. Add in the fact that a 53lb bow allows me to shoot many more shots before muscle fatigue sets in and now you have a 53lb bow shooting a 500+ grain arrow which = slow. It's only 20 yards and you know how far the target is, so speed isn't an advantage at all indoors. I would bet 90% of the guys on the target line at vegas competing are all shooting 240fps or slower with the majority of them falling between 200-225. Hope that helps.