I have about 8,000 mile and about 35-40 passes at te strip with hige burnouts and they are down to the wear bars in the center of the tires. They hook really well when you heat them up alot, but if you are out on a cold day and you get into a street race, they wont hook up at all.
I havent decided if I will buy another set of them when these are totally gone or not, so I guess I'm really not helping with your question too much
good luck,
-Drew