I read so many times people commenting about the R 1200 GS seat not being comfortable. I can not subscribe to this. As for me, the GS was the first motorcycle ever on which I could sit through a full tank until I had no fuel anymore, together with my wife as pillion. That was 374 km / 230 miles without a break. Since then I have done a couple of non-stop rides in excess of 300 km.
But I found myself somewhat forced into an inflexible forward position. There must be room for improvement. This is the factory seat in high position:
The seat slunts down quite a lot, the seating surface is not level. A simple method is changing the seat adjusters. With the adjuster for the rear position to low and for the front positioned to high the rider seat levels much better:
BMW says we should not do this (reference: owner handbook). I found no disadvantage other than the gap in between the seat and the tank:
For me the more level seat is more comfortable. In fact I found this position to be a drastic improvement. Because not only the comfort is so much better, but also the contact to the bike. Conclusion: I need to modify the foam for levelling the rider seat.