I've loved reading through this thread, so I thought it's time I contributed (or added fuel to the fire)...

I've done about 1,500km in the R and it was loosening up nicely - the exhaust note really deepens over time; it's amazing. But now the EPC and Catalytic Converter Warning Lights have come on so I'm trying to tee up an appointment at a VW Service Centre (which is apparently not an easy thing - one of them told me it would be a week before they could see me!).

Other than that....

PROS:
The smile it puts on your face when you floor it in Sport or work the gears in +/-
The RVC - it really is a useful add on
That exhaust note getting better
RNS510/Dynaudio - beats fumbling around with the Gregory's and the sound is so rich
The oil temp readout - takes the guesswork out being sympathetic to your engine
The car's flexibility to cope with all conditions from summer peak hour traffic to the wide open road

CONS:
The EPC/Cat Light coming on!
Sorry, have to say it, but the turning circle is bigger than my old A4 quattro (but that had smaller wheels and the R has the dreaded 19s)
D mode in DSG - it's like driving Miss Daisy
Some parts of the fit/finish - all up it's very good (much better than most), but things like the fabric on the side of the leather seats, steering wheel buttons moving in their housing etc. could be a little better

But overall (aside from the warning lights) it's been an impressive ride and I love every minute I spend behind the wheel!