The Marriott where I stayed told me Presidential was a reliable service for them, so I took there word for it in spite of the bad reviews on CitySearch results.
The hotel called the night before to make the reservation. I got to the lobby 10 minutes early and the driver was already there with the limo. He got me to the airport quickly. No problems. It was $10 cheaper than the taxi.
Pros: Arrived early
Cons: Driver talked on cellphone without headset
more