Just about to replace all 4 on mine - there are Pirelli P Zero's on the front currently, and Avon ZZV5's on the back. I assume the car came with PZeros all round, but when I bought at 13K there were reasonably fresh Avon's on the back.
I am putting 4 Kumho's on tomorrow. KU37 225/40 and KU39 255/35. I have used these on my previous car, but not this one. So with the cost (£74 ea 225s / £135ea 255s fitted), happy to give them another go.
Last car was an A4 3.0TDI Quattro - always thought the Kuhmos were fine on it - grippy, quiet. Wear maybe not as good as others, but for the price still cheaper in the long run even if I do have to change slightly more often. My only concern is will the fuel economy be as good. But will know after tomorrow.