I'd let my Dad drive any of my cars, but he usually declines and is satisfied with going for a ride. My latest project is getting an auto. so I'd let me wife drive it if I was with her, but I could barely get her to drive the car I built for her, so I'm not too worried about it. Other than that I think I'll be the only one behind the wheel. I used to work in a custom shop with a lot of big money cars around. I got a few offers to drive some pretty nice cars, but graciously declined. I'm not going to drive anything I can't afford to replace.