As impressed as I was with the demonstration of these at the ATA show.........boy I'm torn. I get silly sometimes and actually shoot groups which can get a bit ugly on the nocks/fletch.[]
I think I'd cry if I shot the little spin wingy thingy off of one......how would that arrow fly?[:-]

NAP has a neat product, but for that $$ I'm shooting feathers. They take a pretty wicked beating vs. ANY vane.