Audi is nice car, certainly wouldn't say they feel underpowered but its easy enough for you to fettle that should you feel it no quite upto scratch. The auto box is nice but as above once they go wrong its not cheap and it hard to find good used auto boxes.
Once thing i didnt like(but its same across the audi/vw board) were those bloody suspension control arms. Theres 4 per front corner and they always end up knocking like mad.