I went through the research on this late last summer after I finally decided that glasses were worth their weight in gold after pairs of cheapies kept crapping out on me. Now this is me, obviously other folks are good with their choices, so...
That said, I opted for a pair of 580G green mirror. I fish fresh water 99% of the time, and the one time I went out striper fishing in December (Chesapeake Bay), they were awesome.
So taking the 580Gs out on the local reservoirs was an amazing experience, and I can't wait until spawn so I can see the largies sitting on the beds with even more clarity.
I also opted to go the eBay route, and only from reputable sellers with 99.6% rating or higher. So my 580Gs are indeed legit, and cost WAY less than through local/web retailers.