Rod...Here's a test for you. Take a spot shot on a 9 ft table. Load up high running english, and fire the shot in, at a higher speed, from just off the side rail, on the head string. Most LD shafts will get the CB to the long rail, after pocketing the OB, and striking the short rail, somewhere between the diamond above the side pocket and the corner pocket. My G-Core shaft allowed me to get to the long rail a diamond below the side pocket...ino, lots more spin, and less squirt, because I was making no conscious aiming adjustment on the OB. I had a cuemaker take this test, against Predators and his own custom LD shafts, and he felt the same way about the G-Core...that it was better than Predator. These tests were done using smaller diameter shafts (11.75mm), so I don't know if it will be the same for the 13mm shaft.
Scott Lee
www.poolknowledge.com