RE: extreme shrink fletch
I don't have any experience with the extreme vanes but I am shoothing the NAP quickfletch's with quickspins (they also offer them with the twister vanes, they are a little cheaper) I really like them and have had great luck with durability. Not sure about the extreme's but on the NAP's you DO NOT want to try and twist them just no good way to keep them consistent while twisting.