I saw these in Cabelas today. I must say I was impressed with them, I almost took some home! I never thought a high profile short fletching would work for feathers, but they certianly are stiff. It's starting to get late for experimenting, but next season I'm going to try them, four on a shaft and offset two of them further up the shaft (1-1.5") from the other two. I've done this with 1.87" vanes for target archery, and I've found they stablize almost the same as the 3.5"-4" but with less weight - of course that was with a dropaway rest. I don't know if it would work off a shelf...