We have used Thrifty two or three times when we couldn't get anything via Priceline. Their shuttles are very prompt...each time, they were waiting right at the airport. The cars were decent, too. The only thing I didn't like was one of the agents being very pushy on insurance (he started his spiel, I asked him to skip it because I didn't want it, and he got really rude), but that can happen at any car rental agency. I joined Blue Chip so I can avoid that next time I rent with them.
Barb