It always depends on the type of products. Returning products to Asia is not always easy.
Depending on the value and volume of purchases, make sure you get a legal agreement, signed by authorised reps. Even in this case, dont expect to be fully protected when purchasing from this area.
In many cases, the best thing to do is have a pre-shipment inspection. In my case, the extra cost of pre-shipment inspection of EVERY shipment covers the cost of a whole lot of non-conforming products.