They aren't a real experience for a keen driver. They are to say "I've driven a Lambo quite quickly for ten minutes". I would also say go for the Silverstone Single Seater. You can go as quickly as you like. Get the experience, not the thrill though as it's twice as long - 20 mins behind a pace car and then 20 mins as fast as you can. If you really want the Supercar one though then there's one at the old Prodrive track just by Chadwick End., ran by Everyman/Driver's Dream Days and they let you go quite quickly. If you look on my Youtube channel, I have the Silverstone one and my Nissan GTR one was by Everyman but held at Loughborough.