One of the better ideas around in bowhunting, Trophy takers, NAP, there are a few out there now. They all work. Twin forks are better for keeping the arrow on when moving around, whether the twin fork or the straight flat is better for fletch clearance is pretty much a moot point, if you get fletch contact, it can be tuned out very easily,or you can go to a lower profile fletch. I've shot 2 to 5" fletch on 3-39's to 2413's, haven't had any problems with that until I went to a huge 5" fletch installed helical on a 2413, had to turn it, then reset the insert for the broadhead alignment. No big deal.