Thanks to all for this thread. I was considering the Corbin, but now I'm gonna wait. After 4,500 miles I think my stock seat is finally breaking in(or maybe my but). I think what was more important was changing to the floorboards, and the tall risers w/SM bars. I also have the Bella Corse crash bars w/highway pegs. This set-up allows me a variety of different rideing positions. Being able to move around a little really cuts down on fatigue.
Also, the throttle rocker has been unbelievable for my endurance.

Uncle Charlie