I have ordered a Mercedes Star C3 Diagnostic tool for 420$ two and half Months ago.After using the product for 3 weeks it stop working i contacted a Seller named Aaron Zhao and he agreed to have it sent it back and exchange it for a brand new one.I send it back in beginning of November Today is December 31 2010 and i still haven't received my product or my money he keeps making excuses that the chines sales people are slow and that i should wait and i have been for 2 months.Last message i received from him was that Technicians have solved the problem and that i should have it on Wednesday which should have been on December 22 or 29 even though on postal tracking site it still says Attempting to deliver to chines peoples rep and this is after 2 months.I am trying to file a claim over alibaba and paypal but i have a feeling that i will get no where with it.Please stay away from this company it cost me almost 500$ with shipping back cost DRS ELECTRON TECHNOLOGY CO LTD.DRS ELECTRON TECHNOLOGY CO LTD stay away