I had them on my IS350. 25k miles afterwards they still had decent tread in them.
Hard as hell the compound and grip was crap on spirited driving. Later on changed to some Hankook V12.. night and day my friend. Hankooks are so responsive and grippy compared to that.. plus quieter and provided a much smoother ride.

I would recommend getting the Hankooks.. plus they are not that expensive.

Updated Review
 

So I have had the Nankangs on For over a year, and 13K miles. The factory Bridgestones were under 2/32 after nearly 12k, The Nankangs are still between 4 and 5/32. Huge difference.
I also picked up a set for the fronts at around 19K. I can see no discernable difference in handling at all ( under MY normal driving habits) I do occasionally push the car, and have nothing but confidence in the tires. I will absolutely buy them again, and recommend them to others.