I just got an email offer from National to join the Emerald Club for free (a thank you for past business). I have seen lots of posts about the Emerald Aisle, and I'm guessing this is a good deal. Other than choosing your own vehicle from the Emerald Aisle, can someone explain the benefits of being an Emerald Club member? If I understand correctly, you can choose from ANY vehicle in the Emerald Aisle, even if you reserved a less expensive vehicle, (or is that only if they don't have any left of the type you reserved?)