ZMS_A6

I recently purchased an 04 A6 quattro, but my grandfather is now looking at this 06 A4 cabriolet at Autohaus of West Chester. I have heard some people very weary of the CVT and some complaining about a rear window issue. What would be a good offer on this car given these problems? Additionally, what other things should we know as far as maintenance costs owning an A4 cabriolet?

http://www.autotrader.com/cars-for-s...66838949&Log=0