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Ah, si. I have had a 2011 A3 and currently an A4 Avant. I never loved the A3 but it was good for long drives and felt very solid. Interior was very well made and didn't show its age. No issues apart from a major engine rebuild at 60,000 kilometres. Paid for by Audi. My current A4 actually seems slightly less well built but so far zero issues after 2 years... It's a 2015 model with 70,000 kays. They do a lot of stuff well, just don't engage much as drivers cars. They're a bit dull.
Why would you get another A6 if you don't like the current one? Most Audis don't change much through the generations.