On my R1100RT I went with Ohlins. Tremendous difference in ride quality. They got rebuilt a few times, but it still saved money compared with buying always a set of stock shocks.
On my R1150R I replaced the originals with R1150R Rockster shocks that are a step up and I got them for almost no money. If I still had the bike, It would have Ohlins or Wilbers or something.
On my new to me '05 R1200GS I still have the stock White Powers, which are better than any stock suspension on my previous beemers, but eventually they will go too.
Qustion: On my R1100RT the rear Ohlins was adjustable in length without any special ordering. Simply loosen up a lock nut and turn the bottom mounting to adjust lenght. Is that still so on the R1200GS Ohlins?