They aren't safe on the street or the track. They are made very cheep. Only thing they are good for is autocross as being held in is important, and the likely hood of hitting or rolling is 1 in a million.

You can find nice harnesses used for $100 all day long, REAL harnesses. For racers they have an expiration date for competition, that doesn't mean they are not safe or worn out. They are great for people like you, track day drivers, etc to buy.