As a private investigator I get a lot of requests for business due diligence. More and more people are doing business with Chinese companies and it is very difficult to check them out. Unless you have a large budget for an investigation I suggest you try Google-ing the company name with complaints or reviews (chinacompany+complaints). It wouldn`t hurt to ask the company for references. There are MANY companies over there offering similar products, take some time to look around and find one you are comfortable with. Then again, no risk, no reward, right? If you are interested in a thorough search send me an email at firstname.lastname@example.org.
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