Our experience has been less successful than David's. Here are the comments I wrote on yelp after our last, emphasis on LAST, experience:
April 23 - after picking up our luggage, we boarded a shuttle to the remote parking facility and then joined a large group waiting for the Fox shuttle to arrive. We were told only 1 shuttle was currently operating so it took longer than usual. On arriving at the lot, we found a line of 20-25 people in the office and only 2 agents doing their utmost to up sell every customer.
It took a good 90 minutes before we were able to proceed to the lot with paperwork in hand only to discover several others were waiting for cars. 20 minutes later we drove off in a Toyota Corolla with 46,121 miles on the odometer.
May 2 - I filled the gas tank immediately prior to returning the car to the Fox lot. The attendant handed us a form indicating the tank was returned full and directed us to the kiosk for a receipt. There was one person in line, but there seemed to be a problem so we had to wait.
A second agent arrived who could not locate our contract online so after several frustrating minutes we were told to go to the office. Naturally there was a long line, but at least there were several agents. We went to customer service line where another person was in front of us, but there was no agent. Another agent noticed us waiting and left his post to assist us - thank you. He determined someone, presumably the agent in the kiosk, had closed our account and printed our receipt.
With receipt in hand we walked to the shuttle pick-up point and waited for it to arrive, but our nightmare continued because the shuttle driver had to take a restroom break before continuing on. This whole process probably took 30-45 minutes, but fortunately we, based on our earlier experience, had allotted extra time.