Biggest problem is when the classes run back-to-back and you have no time between them. One is on track while the other needs to go to grid. Hard to run the radio-spot-and make the 5 minute call!! I had to call the start at VIR from the grid and get a radio check in the car while she was in impound. Gets hectic!! Still wouldn't trade it for anything--could have a wife that complains about the car instead of pushing to get new ones built.