Not my wedding dress, but I ordered my cheongsam/qi-pao from one of those companies that does both wedding gowns and qi-pao. The workmanship was good, and it fit like a glove except for the part where the measurement I gave them was too loose (around the tummy). So it looks like I have a huge pouch on my tummy, but that's not *really* their fault since they followed the measurements I gave them exactly.
I actually don't think ordering a gown this way would be too big of a risk to take, especially at those prices. Most of the non-couture dresses are made in China anyway. (I think my Maggie Sottero was made in China.) If any country is an expert at good fakes, they'd be it -- they make so much of the genuine stuff anyway -- and that's where most of the dress copiers I've seen on Ebay are based.
I didn't order a wedding gown from the company I ordered my qi-pao from because I didn't know what looked good on me until I went to the bridal store, and ended up buying it on the spot when I found it.