As BenzModz says, there are lots of different chinese versions of Star - there are at least 2 different "fake" multiplexors - one is good , one is rubbish.
By using a fake you can cause all kinds of damage (yes, including fire)
If you are willing to take that risk, I know of 2 people who have bought systems from this chap on eBay and seem to be pleased with them ...
eBay UK Shop - CarECU Workshop: Diagnostic Tools for Benz, Diagnostic Tools for BMW, Other Sepcial Items
Richard