I was in the pits for the Continental Challenge race at Daytona this year, saw a fwd car come off the track after an hour on the Continental rains, and they were in excellent condition.  At least 45 mins of that time there was a dry line and at the end the track was pretty thoroughly dry.  I was amazed how well they held up.  The Hoosier H2Os are allegedly the same tire.  Very impressive.