Got a response to my questions and its all good news:
Engrish answers are in red.
1. Does this unit support OBD (on board diagnostics) for the BMW E46?
2. What bluetooth module do you use and is it phonebook compatible?
2,bluetooth 2.0. and compatible with phonebook function.
3. Does your unit have a dual radio tuner?
4. Do you have the user manual in a format that you could email to me? Preferable English but I will take it in any language available.
4,no have PDF file now,it only a book. yes.it is english version.
I went ahead and ordered one via alibaba and escrow so we shall see! $520 was the total.
If and when i receive the unit I will post pictures/video/review.
Probably will take two weeks at best.