I'm a 10 handicap these days (the worst putting 10 cap you've ever seen:), and currently play S300 shafts in my irons. I've tried the KBS tour shaft and found success with knock down type shots but couldn't control the ball with full swings. I've also previously played the DGSL shaft with some success. The KBS C-Taper Lite shafts sound like they might be a great match for my swing.