@ bcheng4jc: My reliability has been good but only have just under 3000 miles on it. Have noticed a slight steering wheel vibration at ~60-65 mph and the occasional rough idle when in neutral. I will be talking to my dealer about these minor issues soon. As for insurance, mine went up $10/mth when compared to the 2005 Benz SLK 55 AMG the S5 replaced.
@ JohnPA: Welcome to the forum. Sorry, I don't know anything about chipping these cars. Mine's leased so I'm staying away from aftermarket mods.
@ Macwm. A brilliant red A5 did pass me on 76 eastbound about a month ago about 30 miles west of KOP, before I had my car. I was in my black SLK 55 at the time. It was the first one I had seen 'in the wild'. Could have been you.