Just a couple of issues I have with my car which may help others.
Open Sky roof - Very very rattly, it has been in the dealers for a week now and still no resolution. Latest advice from Audi is to exchange the seals. If that doesn't work then the roof has to come out.
Wheel/car vibrations - Symptoms are that you'll feel a bit of vibration especially at 75mph but also once you realise it's doing it you'll feel it at most speeds. It does also seem to vary with the road surface and also lessens as the tyres warm up. First dealership failed, second and much better dealership identified mis-shaped tyres. There is a TSB about it and if you google it seems to be a real problem from A5 owners. Upshot is the original tyres (Bridgestone Potenza RE050) appear to be susceptible to damage when the vehicle is left parked. TSB has some frankly ridiculous procedure requiring the tyres to be 10 PSi over inflated, the car to be driven for 30km's at speeds up to 130km's/hr to heat the tyres before rushing back to the workshop lifting the car to get the wheels off before they cool down and balancing them. About 3/4's of the way down it says if this fails replace the tyres. Some pressure from me to Audi UK and as I said a very helpful dealership has meant an advance to plan B and all 4 tyres replaced with Michelin Pilot Sport 3's.
Hope this helps someone.