I got my Corbin this last spring (2005) and have 4-5000 miles on it. I've always thought it was a squidge too hard. My butt was going to sleep after 50 to 100 miles. I didn't experience that with my stock Speedmaster seat. I think it was better toward the end of the summer, though, because I don't remember it happening as much. The Corbin is noticably more narrow than the stock Speedmaster seat, which gives me less real estate to plop my butt on. I assume it's narrower than the America seat too.
I sit an inch or 2 lower with the Corbin, and I like the more abrupt slope and firmness of the back of the seat. It gives me more support. Also it keeps me from flying off the back when I accelerate, which is a good thing because the black and yellow Speedmaster is so much faster than all the other Triumphs.
cody
