I had a pretty in depth discussion about this with a local guy here that really knows his stuff (won vegas pro class and multiple time NFAA national champ both indoors and out) and he tells me that helical does not stabilize the arrow faster and will not make the arrow spin to a point that is measurably faster. Helical seems to be harder to get vane clearance with on the rests I choose to use as well, so I prefer to go with an offset and even before I had this discussion I never saw a different whether it was with broadheads, FP's, etc.........