I fly a Citation for one of the drivers and manage two other airplanes for another team. Also manage a Citation for a developer that I can drop back to in case my Nascar gig goes south. Like the previous poster, I was worried about job security because my driver lost his ride at the end of last season. Fortunately he rebounded and is set for 2004. But there is always the question about next season. This is not a job for the faint of heart, but it beats the he** out of flying for my former airline.
It's a great opportunity if you have the qualifications, but there is not a lot of turnover. You have to be here (Concord, Statesville, Hickory) or you will not find a ride. Nobody gets hired who is not living here. I've filled all of my airplanes from acquaintances and guys working at the FBO. Not a great deal of long term job security. Get hurt, get released from your team, or lose your sponsor, and there's a good chance you'll lose your job.
Great schedule and great people, though. I much prefer flying the driver rather than flying the team. Much more relaxed flying.