I wanted to deal in them, but don't have the time. These are more around the state bike, rather than around the states. There is a story of two guys who ride Zongshens thru China in a one month time over 10,000km's. On a US forum, one guy rode a brand new Roketa (comes with a Lifan engine) for 500 + km over two days. (Nothing broke on him)
The point is, these bikes are not good for RTW or even cross the states (due to top speed vs. reliability as on several Chinese motorcycle Yahoo group members are reporting 1000's of km with little trouble). I thought if someone was in the states for a few weeks and wanted a bike with little comittment/investment, these might be cheap alternatives. (You could lose the bike in a high stakes poker match the last day of your stay).