I don't know if the frame itself is much more flexible, but the O3 Tour feels a good deal softer to me than the Hybrid Tour - I'm actually pretty sure than there is a difference in basic frame stiffness. I also got the impression that the Tour was less head light in balance than the Hybrid Tour, so I had an easier time identifying with the "HT". For me, the Hybrid Tour feels a lot like a lean version of my old ProStaff 6.1's and I consider the Hybrid to be an especially good all court frame.