I brought my wife an RS3, back in March. Great car, very easy to drive fast in all conditions, fuel economy is very good especially on a run ( better than her old ED35 Stage 2)and the engine note is the best i've heard this side of a V8!
Reference the prop shaft, I broke mine, and was all replaced by Audi no issue, they lent me an S3 whilst it was done. There only seems to be a select number of these going, and they brought out a software update for some vehicles, to combat the issue. Launch control is phenomenal, and has been timed around 4.1 seconds, see you-tube!
I also had the squeaky brake issue, not as bad as some, but have now had new discs, calipers and pads fitted.
Audi gave my wife a nice big hamper of food and drink and me the first service FOC as compensation (which I wasn't after) so that's nice
Its a great car, I love it. I say go for it. I have it financed with Santander, with a good residual payment, and the price of them seem to be holding very well.
Pictures when I got it;
See
www.audirs3oc.com