I had a 360 on my Switchback, set at 70# and it kept breaking the little plastic bottom rest. The "New" and "Improved" have brushes on the sides and improved the flight. It tuned easy and flew well, just a bad set on replacement rests I believe. ALOT better then the WB because it didn't slow my arrow but 3 fps. WB took 17 fps away. A couple of staff members at Sparta, WI at Mathews use them and love them.