I have used Fox many times. They are always friendly and provide nice cars. I agree with Scott L's post about the lines...it took for EVER for us to get our car.
We rented a Honda Civic Hybrid for around $40/day. Not bad for a Hybrid! We saved a TON on gas in the 600 miles we drove in 4 days.
I'll return to Fox again, but PLEASE get more people up at the desk...it is bad when people in line feel the need to complain before they even get to the front...