I just wrote an entry in that thread – go read it. You need more numbers from the dealer, to check them against Edmunds, to search the forum for similar deals, etc.
I find Audi deals to be way too high but this may prove ok given Audi pricing, discounts, money factors, residual values, incentives, etc. For me, I wouldn’t want to pay over $615 (effective) per month for 39 months for an A4. For the price, or for less, you could do better IMHO.
Look through the forums for competitive deals. Or consider a broker like @nextlevelautobrokers or @nyclife. They’ll do the work for you and save you time and $$$ in the process.