The Quickspin vanes are not worth the money. Me and a buddy of mine purchased them together to try them out. We were very disappointed! Yeah they do help out the spin of the arrow just a little bit but they make a god awful whistling noise flying through the air. And as far as better groups, no improvement for either of us. JMO but I would save your money and put it towards something else man! (and if you want better groups, JUST PRACTICE) these vanes are not the way to go.