Finally, I’ve found a forum topic I feel confident I can comment on as I’ve played both shafts, albeit neither for extended lengths of time.
KBS tour- feel amazing. One of the more responsive steel shafts for my swing that I’ve experienced. That being said, always felt I had to give it the nuts to make it work. Plays stiffer to a soft transition than the flex warrants. If I had to guess (which I am-heavily!), the counter-balance aspect of the shaft has more to do with that than the cpm or flex. It seemed like the more speed I tried to put into it at the top, the more consistent the results.