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there are a number of seemingly pristine Audi TT Quattro roadsters on eBay right now for @ $16,000 average price...anyone have any experience with these cars? I would love to hear some opinions...

I once test-drove the coupe version with the V6 and the DSG transmission, largely for the purpose of giving the DSG a try. While I was there, I also tried the much faster Audi S4. My conclusion was that the (slower) TT was much more fun than the (faster) S4, largely because the DSG transmission is really a joy.

That said, I'd be particularly hesitant about buying the first model year or two of the TT's with the DSG, because you're getting something really, really new and different from previous transmissions. How reliable will these things be? Do you want to risk it?