I was a little wary of purchasing on-line from these guys, but I couldn't resist.  After my on-line coupon, etc. I got them shipped out next day air for about half the cost of what Sunglass Hut was charging for these Tortoise, 55mm, GL15 lens New Wayfarers.  Got them in two days, went over them carefully and checked for authenticity.  They are the real deal, and were complete with the instructions, case, cleaning cloth, and retail box.

I advise like the other reviewers to try them on at a store first, then you'll get the size that works best for you.  I'm an average sized male, and the 55mm were a perfect fit.  The G15 lens is non-polarized, and fairly neutral for color rendering.  My normal sunglasses are American Optical pilot's glasses in neutral grey (for realistic color rendering) but I like the G15 lenses on the New Wayfarers just as much.

In short, for a real retro look, but updated a little, you can't go wrong with these sunglasses.