I'm an an S3 but my second set of Conti's. I put the softer sport attack on the front to give me increased confidence in the front and the road attack on the rear. I prefer this combination to the pilot powers that Speedy comes with OEM.
This set have 9000km on them and only look about 70% worn. Which is a bummer as I have a 5000km ride coming up next month so will have to change them early!
I've done slab comutting, day rides, and a few hundred K of dirt on them (including a flooded causeway crossing

).
I'd like to try the Avons, one day, but so far the conti's have performed so well there's no need. I don't like metzeler personally - unfair really as it was a cross ply metzler I last tried about 11yrs ago!
Oh, me getting over 9000km (should see 10000 no probs) is unheard of, I'm a heavy lump at 125Kg so I don't usually see long tyre life on tyres I have confidence in. Here's a pic of the rear @ 8000km - almost like new.

Russ