It's the same with ALL triumph seats.
Historically, people either LOVE them, or hate them. Check the price on it and see how much more a Corbin seat would be (if they make one for that bike).
I don't know any firsthand info on the one for the 675, though. Check over on triumphrat.net or one of the 675 specific forums. I bet you'll find the answer there.
(don't forget to post pics when you get that thing!)