Friend of mine had a very similar experience with the Direzza's on his MINI. We both got new tires just before a DE at Road America last July. I got the Ecstas, he got the Direzzas. By the time of his next track event A MONTH LATER, the Direzzas were bald.
In contrast, my Kumhos have lasted three track events, and about 3,000-4,000 miles of street driving in the meantime, and are still going strong.
YMMV, of course.
Cheers,
Jason