We've just finished 1200kms on 2 track days at Mosport this summer and considering the hot summer that we had in Ontario this year these Hankooks held up very well. They are very good for high speed brake stability and they communicate at their limits very well in corners. Keep in mind that Mosport is the 3rd fastest road course in North America and the SRT6 is hitting top speeds over 220kph (140mph), so these tires are definitely being pushed very hard.
I've written this before but a European tire test compared Hankook to Michelin, Bridgestone, Pirelli, Continental & Dunlop tires and the Hankooks came a close overall second score to the Michelin PS2 tire. Now if I were racing that would be an important thing to consider but for every day use and occasional track day use the Hankooks do 95 to 90% of what the Michelin will do for near 1/2 the price and 10-15000km more tire tread life. I can live with that.