They last WAYYYYY longer than race tires.
And stick almost as well....80-90% IMHO.
I did two endurance races on one set, that were given to me free, that had six days at Calabogie already on them, and they still looked mint. In fact they still look pretty good AFTER my two endurance races. SOmeone who rides green or yellow at a trackday could still get a few trackdays out of them.
As Smergy said, when they're cooked, they get greasy, but it's smooth and predictable. At the end of my second endurace race, I could drift out of any corner exit at will, and it was never scary. The front was great, even braking deep into turns from top of 5th gear.