I rented from them last year terrible. Pay the extra and stick with someone else. You have to take a second shuttle from the car rental center to get to Fox. After I rented the car and FINALLY got done there I had already wasted an hour and 15 minutes. Have to allow extra time to return car too so you have anough time for the second shuttle to get to the airport.
After my trip last year, I've decided to stick with Alamo since I'm always in and out within five minutes max. Time is especially important to me since I'm usually in late after work, hungry and tired..