Has anyone ever rented from National using the Emerald Aisle and gotten a nicer car than they originally rented. I have read that you have your choice of any vehicle located in the Emerald Aisle lane. This could be a van, SUV, full size etc... but that you are only guaranteed what you reserved. There is nothing about this aspect of the Emerald Aisle Club written at Nationals website. I would love to hear from anyone who has used this service. Pass on your experiences to those of us who are considering renting from National.