Have had this for probably about 10 years now with National and it's very convenient, haven't had to talk to anyone at a desk yet. I fly into DFW every few months or so to visit parents and National has a pretty big lot there, pay for a full size car for access to it and I always drive out with a SUV. Just hand license to clerk at exit booth, they scan car, confirm payment and that's that. No listening to anyone trying to sell you more insurance and other options. Process is the same at every airport with that option, all are different in types and number of vehicles available but I've yet to hit an instance where I reserved a car and none were available when landed. Closest I came was last year and was delayed getting to Denver. They were down to a couple of Ford Fusion's and Chrysler Pacifica's.