I have used the Bitz, Jo-Jan, Martin, and Bear Paw jigs, and the Bitz gives the most helical of any of the ones I have used. In fact, it gives so much helical that I prefer to use the Martin on skinny shafts like VAP's, because I have trouble aligning the feather on top of the shaft with the Bitz. I keep one Martin jig permanently aligned for fletching VAP shafts, since it was a lot of trouble to set it up in the first place, and I don't want to have to do that again. Plus, as much as a Bitz costs, I wouldn't want to dedicate one for something I only do once in a blue moon.