Put this on a carbon rear wheel from light-bicycle (Hope evo hubs) on a 2014 StumpJumper Evo 29". So far this upgrade is well worth the $ spent, X01 + grip shift makes shifting super fast and intuitive - I know XX1/X01 is "super high-end" now, but it actually makes shifting so straightforward it's something a beginner would better understand. I ride xc mainly and it's so much easier to change gears on the variety of short/long hills of varying steepness.
Stock x7-9 setup sucked by comparison IMO. Shifting on this is super fast/smooth which changes ride quality for me completely.