Couch, I pick my reshaped corbin up from MJM tomorrow. (report to follow)
I can tell you for fact, don't waste your money on a Corbin, if you are looking for a seat.
It came with the bike, so MJM has it.
MJM won't touch Sargeant seats, and really doesn't like reshaping Corbin but will, with no guarantees.
MJM prefers to work with the original seat, saying they have more scope for adjustment/reshaping to the customers requirements.
JUST FOOD FOR THOUGHT