I previously posted that i've heard a lot of good things about the cf650nk, but i've since heard some pretty bad reviews. It's all chatter of course, but i was out with 18 bikes riding through Zhejiang and the cf650nk was the only bike that had any problems. The guy riding it absolutely hated it. Most of the group said that the engine is terrible and completely untested, and it certainly proved to be the case as the rider had to coast back down the mountain to safety.