I did it, along with a girlfriend's DH back in '06 ... it was GREAT!!! We were signed up to do the drive, then decided to do the ride-along first so we'd get a feel for the track.
Just remember that you need to be able to drive a manual transmission car (clutch). I hadn't driven one in a decade or more and ground the gears a bit ... oops!
Oh and it took up most of the afternoon ... driver's attend a short instructional class, then suit up, we had 2 sets of cars on the track at a time, once everyone finished their drives we went back to the classroom for the "closing ceremonies."