I've had my R for 5 months now and previously owned an ED30 for over a year and my thoughts are similar to p3eps and Danno above
IMHO the R is a better car to drive, being faster and completely planted at all speeds and in all conditions.
Running costs for my R are about the same as my ED30, with mpg, tax and insurance only very marginally more expensive.
Official lap times for the R show just how fast it actually is compared to all previous fast Golfs, despite its AWD weight.
http://www.fastestlaps.com/track24.html 87th compared to 130th, 165th, 169th, 173th and 204th
http://www.fastestlaps.com/track7.html 171st compared to 282nd, 296th, 307th, 331st
The R certainly feels much faster on the open road than my ED30 did
The only downside is the price

Some also don't like it''s rather "clinical" drive (i.e lack of excitement) but as a long term ownership prospect I find the R is a fantastic and practical all rounder, in all weather conditions
