Fox is a second tier agency.
We once used Advantage, another second tier company, and it was a hassle! Not near the airport, shuttle bus not very clean, customer service agent not very friendly. Paid for a compact class car, was assigned a beat up economy. Had to argue to get what I paid for...Nothing horrible, just took some extra time and patience.
I would suggest using Hotwire. They only use first rate rental companies. I've gotten really great rates with them. $9 a day, plus taxes for instance!