Here's a quick summary of when Sofeast clients will benefit from using the Free Trade Zone facility:
When some/all of the components come from outside mainland China. They can be stored, assembled, packed, and shipped out, without technically being 'imported' into China at any point.
When the supplier can only handle a simple approach (get paid, process the export documentation, nothing else), but there is still a lot to do in China -- for example shipping the goods in several batches to different countries in different phases, keeping some cartons there for some time (in a secure environment, and ready to be shipped out), etc.