The Phoenix rental car facility is great on its own, but the experience I had renting my car with National was outstanding. I loved driving a Passat from Phoenix to Sedona and back. The power definitely helped on the hills. The woman at the front desk was very friendly and so was Kimmy, who joked around with us while she helped us pick our car in the large structure. Some people seem to dislike that it's a 5-10 minute shuttle ride from the airport to the rental car facility. I think it's great since all of the rental car companies are at the same facility there is no wait time at all to get on a shuttle. That has nothing to do with National itself though.