I have had the opportunity to use Emily of Capital Concierge On-Call's transportation services on several occasions, including for transportation to and from the RDU Airport. I find her prices are reasonable, she was on time and a reliable alternative to taxis or any unknown internet provider. I appreciate dealing with an actual professional person.
She has also provided assistance with a medical visit where I not only needed transportation but for someone to wait during the visit, which is a service you can't get from a taxi. Capital Concierge can tailor any service offered to fit your needs.