Yes, I'm running a BoxTwo Prime Nine setup. So far, I have been very happy with it. Shifting is solid, and there haven't been any ghost shifts under load. I didn't figure that the fine adjustment of the strength of the clutch on the derailleur was worth the extra cost of the BoxOne version. I'm using compressionless Yokozuna cables/housing, so that probably helps some, too.Absolute stunner, that is an incredible bike. Is that a Box drivetrain on there? Details and/or reviews? Verrrrrrrrrry interested!