Ehh.. they weren’t that bad. They mostly got the aluminum frame correct, but didn’t make the front bulbous, and made the facial interface fabric way too thin/narrow (I called out the concept renders on that multiple times).I love how wrong all the internet "mock ups" were.
And I wouldn’t be surprised if the back of the head strap is a rather new addition. I could see earlier demonstrations of the product using a simpler design that has the standard rubbery watch band material around the back of the strap.