RL of MtnBikeRiders.com and BikeCommuters.com has been putting a Double Cross DC (Disc/Canti) through its paces for over 2 months now. If you are considering a Double Cross and want RL's opinions on it, feel free to post questions in their blog comment section here or here.
He has set it up with cantilevers and flat bars. He built it as a commuter in mind, but has done a lot of off roading on it, too.
Goofy necessary disclaimer: We did not ask MtnBikeRiders.com for a review, nor are we paying anything for this review.