I just wanted to say a good word about my experience with Baldwin Saddles, a motorbike saddlemaker out of Baldwin, KS. Loren Mock there modified my stock K1200S seat to beef up support in the inner-thigh area (cures the butt-burn), added a gel pad and rebuilt/leveled the rider section with memory foam. He built a new cover with nice quality vinyl, a grippy center section (to help with sliding) and custom embroidery. Turn time was about two weeks after I stopped suggesting changes (doh!). The result is much more comfy for long trips, stops the forward slide on downhill and braking maneuvers, and still allows plenty of side-to-side movement for dealing with the twisties. I couldn't be more pleased.
You can contact Loren at www.motorbikesaddles.com