JUST DID
I bought two R1200-GS's a year ago, one for my son and one for myself, my bike has functioned to perfection, no claims whatsoever in 14,000 KM.
The other one has had serious problems with the ralenti valves in two opportunities. (It self accelerates itself when you less expect it)
I just decided to trade it in for a new one which will be delivered to me next week.
So, I guess we love these bikes, and believe that problems have (mostly) been sorted out during the first 18 months of production.