I guess there are differing opinions on the knock off route. I'm in a situation where I have my wedding dress but wanted a second one without the hefty price tag that comes along with "original designer dresses". I think depending on which vendor you use, you can have a great experience and get the dress almost exactly the same. If you are careful in your selection of vendors, they will tell you how close they can come to the original. For me, they can come to 95%. For $140 dollars, 95% was good enough. For whatever reason, some girls are very much against the Knockoff Route. I personally have no issues whatsoever. I suggested it as an alternative to having the very expensive original. Not as your first dress but as a second. I think you should do your research and make your own decision. If you need any help with suggestions on vendors, I'd be happy to help you. There is a massive thread on this forum on knockoff dresses but it's pretty huge to navigate through. One of the other ladies on that thread was very gracious to help me.
Good luck and do not toruture yourself over your dress. The one you purchased is absolutely stunning.