As noted above, I've heard good reviews from the Arizona... That being said, if you want a fletching jig you can pass down to your grandkids, splurge and get the Bitzenburger. I started with a straight clamp, and would use it to fletch offset. I've since bought a right helical, as I shoot fallaways on both my BowTechs.

Prevailing wisdom says that the tighter helical you can put on your arrows (while still maintaining fletch contact with the shaft), the faster your arrows spin; that translates into more control in steering a broadhead.

I fletch right helical in an attempt to keep my field points from unscrewing every time I shoot into my bag target, though I couldn't swear it does any good, as I'm constantly re-tightening them during practice sessions. Maybe left helical would be a lot worse.