I have had my A5 for one week, so this is all very preliminary. I came from a BMW 545i. I test drove the S5 and fell in love, but with two kids in college, I could not justify the extra $.
Anyway, so far it has been a blast to drive. I love this car. It has snowed three times this past week and I find myself looking for places that haven't been plowed just for fun. The 545 was all but undriveable in the snow.
The interior is a treat compared to my old car. My wife drives an allraod with a six speed, so there was a already a familiar feel to the interior and the shifter. The MMI is very easy to use and the ipod adapter is so cool. The 3.2 is surprisingly powerful, but I don't know if I would feel the same if it had an automatic. I never got the hang of driving automatics, so that might be an unfair criticism. I wish it sounded more like the S which has the finest exhaust note I have heard in a long time. Maybe some aftermarket pipes will help. One thing for sure, the steering is much lighter than the Bimmer's; but, that is not a criticsm. The Audi is eminently more driveable.
Once they fix all the potholes around here and I get a chance to really open it up a few times, I will report on how it feels at high speed.
My friends and I test drove an A5 about 2 weeks ago. It was a beautiful day, no rain or anything, sun was out... perfect. We took it out on the highways here and opened it up. You don't even feel like you're going fast. Everything feels slower. 75 felt like 55 and 55 felt like we were crawling. If feels very, very smooth at high speeds.
i wish we could test drive them here in germany, but they are also hard to come by. If we order an american Spec one to bring back to the states, it would be ready in Sept :(.. but it would be fun to drive on the autobahn before we go back. I like the S5 myself, but I don't think I can pony up the extra 10K plus for it. But I think they are cool cars. Its between the audi a5 and a BMW 335xi right now.
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my new A5 - 
