I had polygons on 06 juicy 7s and eventually switched to the clean sweap rotors after they started rubing and creaking at times. If you are switching rotors it's a good time to look into going up a size in the front which will require a different mountion bracket for the caliper at a minmal cost. If you ride some technical trail and have any body weight at all you will like the larger rotor up front. I made that change on my 7's and run the same set up on my Ultimates on the new bike (with clean sweap rotors 185 front, 160 rear). In addition to better modulation, more power and elimination of almost all noise, the rotors stay true and don't rub any more. That said, having an experienced mechanic set everything up is as important as the components.