The description I got from DH is that stiff will mean there is no flex in the bottom bracket when you really crank on the pedals, cornering will be really precise, braking will be really direct. Basically, there will be no or much less energy lost in any movement because the frame won't flex when you do those things. However, because it is carbon, and because of the design of the frame, any harshness or vibration will be greatly reduced, making it still feel quite comfortable, in fact, still a lot more comfortable than your OCR.

You'll really notice the geometry puts you into a more aggressive body position, which I think is exactly what you want.

Go for it! heehee

H&B
~T~