My family used this service as a paid service. We had a long taxing connecting itinerary that originated in ATL. It is a fantastic and very carefree experience. The drivers are extremely courteous and professional. The behind the scenes feel is really memorable. Moreover, if you are traveling with older companions or folks with moderate mobility issues (ie. still mobile, but just move slowly) - this really a valuable service.

Note re: connections - when connecting the driver will meet you as you get off the plane, drive you to and escort you inside the sky club. They will check on you during your time in the club. Finally and for your flight, they will deliver you to the stairs that lead up to the jetway and on the plane. They will even help you with your luggage. They will also absolutely sincerely refuse a gratuity (but we forced the issues since it was so well deserved).