Anyone have experience with buying multiple season DVD sets from sellers in China/Hong Kong?

Here is a seller from whom I am potentially interested in buying a complete season 1-4 dvd set of Star Trek Enterprise:
http://stores.ebay.com/m-t-s-Store_W...toreviewQQtZkm

I'm not at all interested in having "original premium US collectors sets"; I just want all the episodes cheap and don't care about the packaging. How are the quality of such sets (i.e. video quality)? Will these have all the special features intact? Anyone order something like this before?

I appreciate any insight.