The Direzza Star Spec is very close to being a dedicated track tire. Excellent grip and stability, but no-go in cold winter conditions. My primary complaint was the tires' want to tramline in pavement ruts/groves/seams.
Tread noise from day one - and it got much worse as the tires aged. When wearing to the indicator bars, they were howling down the highway. All the while, the tread wore evenly and without incident.