Inexpensive, stiff sidewall, predictable, and one of the the stickiest compunds for the street. It's not a coincidence that the top 4 drivers at 2003 Solo II Nationals (STX) and 7 of the top 10 were on Azenis. There were 5 WRX's out of 12 trophies and 3 of them were on Azenis including #1 and #3 finisher.
The Azenis does get a bit oily when they heat up, so after a couple of laps at the track, they would start to slip- but it was very predictable, and still an effective tire at the track.
As for the durability, I have had great experiences- but on much lighter cars. One set on my integra (about 2600lbs) went over 10k mi, 5 autox, and two track days, and were stolen before they were done, but had a decent amount of tread left. Another set (Miata, about 2250 lbs) has gone 12k mi, 2 autox, and over 200 miles of track duty, and they still have more than half of their tread left. These are still on the car, and I can take pictures if it would help.
Sorry for the long post, hope this helps.
nk