Honestly it's not worth the risk, yes they're cheaper and you're saving money but they're done to a really poor standard - and the ones I ordered were just a plain satin material, no fancy business. I've emailed their customer service frequently and even after they eventually said they would compensate me 10% of what I spent I've since received nothing and now don't get replys to my emails at all.
My honest opinion is you'll more likely than not need to pay for alterations for the dress as well as the dress price and shipping, if that works out cheaper for you than getting another dress than it might work but it didn't work for me.