I've used Avis twice at MCO and have had great experiences both times. Back in May I did an "Intermediate" and when I got there, they did not have any left and I ended up in an Infinity G37 with less than 200 miles for no additional dollars. Not saying this will happen for you (or for me again), but I need to give them props as they earned it on that occasion. BTW, that one was assigned for me and I believe that is what they do, but I can't be 100% sure on that. IIRC, I did not choose my car the previous time either (back in 07).