Granted, this product is nice but I'd advise anyone to think twice about their needs before purchasing. I realized after I got it that a MacBook Air can only take one thunderbolt adapter. And the reason I usually need an adapter is because I'm at a conference podium where the wifi isn't usable. You can't use both this and a display port adapter at the same time so I had to also get a USB adapter.
This adapter is super fast so I plan to keep it for any time I need to do big transfers. But definitely consider your needs a bit more carefully than I did.