Just got back from the track with the direzzas, IMO great performing tire. Not as Azenia, but of course alot cheaper. The track I took it took was Arroyo Seco in Deming, NM.
http://www.arroyosecoraceway.com/images/track.jpeg
That is what the track looked like, very tight, very technical. The good thing I noticed about the tires were, they provided good grip cold, and when the tires heated up, the grip was of course better and it stayed that way. I ran the hell out of tires. A whole track day from 8-5. I was going to take it to the AutoX today, but I was so tired after arroyo seco, I couldnt go. I was running 2 days already with about 3 hrs of sleep. Once I got home, I hit the bed and didnt wake up till 12. The tires respond very well, are predictiable, quick responding. I didnt have a pyrometer to take temps and tune them even better, but for what I have done, they are competative tire. IMO 4 outta 5 stars, easily.