I also use it for fine tuning my bows. Or should I say micro-tuning. While many guys paper tune I consider it a waste of time. Don't get me wrong. Any tuning is better than none, but paper is just getting the rough edges out of the arrow flight. I can do that with my eyeballs with the initial mounting of rest and such. But when I start playing with the bare shaft a lot of inconsistencies can show up. It's just plain fun to "outsmart" this thing. When I get a bare shaft flying into a 3" bullseye at 35 yards, and all I see going is a nock, then I have things pretty well in hand. I can expect target points and broadheads to shoot to the same point. And it usually works that way. Makes for a very forgiving setup and sure shows me if my form is off on that particular day.