We just returned from 9 days at the World. We had reserved a full size car from Emerald Aisle over the National EA web site and were pleased to drive out of the Airport in a Chevy Blazer. When we returned the Blazer the aisle attendant checked us out and finalized the bill. The bill was higher by about $40 from our confirmed quote (which I thankfully had a copy of). I asked the attendant to fix it but he said we would have to go to the National counter at the airport terminal to have it adjusted. Luckily we had plenty of time before our flight so we walked over and had the EA service person adjust our rate. I asked her why this happened and she just blamed it on the computers. I don't think she would have changed our rate if I hadn't kept a copy of that earlier confirmed quote. So beware everybody to check your final bill and document your web rates. Especially when you get a great rate!