I had these on my a4 b7 for approx 2 yrs before i moved on to my A5.
I always had the zz3 before that, hands down i think theyre a very good tyre for the cost of them.
Although they are classed as summer tyres the hold really well in wet conditions.
I'm not the easiest driver on my tyres & these still had life in them after 8000 miles.
When i purchased my A5 i wasn't happy with the cheap tyres it had fitted so as a deal breaker i told the dealer i wanted Avon ZZ5's alround.
Ive just taken delivery today of some nice shiney new veeman vc7 alloys with a set of 255 35 19 Avon ZZ5's to boot & they will be fitted in the morning, slightly excited is an understatement!
All in all i guess i'm a bit of a freak for Avon tyres so would recommend them to anyone.
P.s. They are low on roadnoise too which is a bonus.
Hope this helps matey....