We pre-paid with Quick for our trip last week. DON'T USE THEM. They were late picking us up at the airport. On the return day, they were late, called to say they'd be there in 10 minutes. When I called 20 minutes later, the guy said 5 minutes. We finally grabbed a Mears ($37.90 plus tip for 4 of us with 5 bags) van/taxi and just made it through security with 5 minutes to spare. Based on our experience, we'll go with Mears next time.