Consumer Reports (CR) magazine surveys owners of cars and analyzes the data to assign reliability ratings. The A5 is too new (and perhaps too rare) to collect sufficient data to rate its reliability yet, but the A4 has a predicted reliability rating of Average. The A4's reliability has been improving over the years, but has never been above average in comparison to other cars (especially Japanese). The V6 model has been slightly more reliable than the 4-cylinder. Also, the last major redesign in 2002 was no less reliable than the preceding years, which is a good sign for the A5 and new A4. Trouble spots for the A4 have been engine (minor problems), fuel system, power equipment, and audio system.
Just for comparison, here are CR's reliability ratings for some of the competitors to the A5:
BMW 3-series coupe - Much better than Average (note that turbo and AWD models in 3-series are only Average)
Infinity G37 - Much better than Average
Porsche Boxter - Better than Average
Mercedes-Benz SLK - Much worse than Average (as are virtually all Mercedes models)
Lexus IS 350 - Much better than Average
To me, reliability is a very important factor in the purchase of a new car, as I usually keep a car for 7-10 years. I am leaning heavily toward buying an Audi A5, even though it would be the first time I've bought a car with anything less than "Better than Average" reliability. I just can't get very excited about the alternatives to the A5. While I'm concerned about reliability, I'm even more concerned about the poor sales and service quality provided by our local Audi dealers in Northern Virginia as reported by Audi owners on
www.dealerrater.com. If I buy the Audi, it will be from Tischer Audi in Maryland, but going back there won't be practical for regular service or repairs under warrantee.