No but a lot of my friends have done it and everybody to a T says that it is the event that you have to do at least once.Car & class choice seems to make a lot of difference in how much you enjoy the event.The biggest thing is to have a car that has reasonable ground clearance with a very compliant suspension as the roads tend to be quite rough and dirty compared to what you see in circuit racing.It is one of events that someday I have to do!Not a cheap event to do for sure.
Here are some rentals availible with an experianced team.
http://users.eastlink.ca/~mcnuttracing/targa.pdf