I've had corbins on all my bikes and loved them. Never had a bike like the F800GS though so I am not sure how they are going to translate. I know the corbins for some models are sh!t. I like the firmness of the corbins, provide great support all day long. I pulled these next pics from this forum I think? saved them as 'DavidCorbinSeat'. If I order the corbin, it will look like this:
The other contender is the TourTech High.