This is my second season racing the QS2 frame and I love it! However, the QS2 frame is a more AGGRESSIVE geometry than the ZX3, not more relaxed. For example, for the 52/53 frames the QS2 has a 74.5 degree seattube angle as opposed to 73.5 for the ZX3. The same goes for the headtube angles which are about 1/2 degree steeper for the QS2 than the ZX3. In rating the QS2's ride quality including power transfer efficiency, bottom bracket stiffness, smoothness over rough roads, cornering/handling, climbing, and high-speed stability, I'd give it a solid 9.5 out of 10. The only place I wouldn't give it highest marks is in high-speed stability in descents over 60 kph. With its somewhat steeper angles it's more inclined to quickness in steering/handling as opposed to high-speed stability. Just my 2 cents ...

Cheers! - RJ