fast1.
I didn't like the Corbin DT because of that.. Noticed a huge loss of room from stock to that seat.
I didn't notice any on the rumble, but after riding this seat for many miles, and having the stock seat on only a couple of times since, I can say there is a slight loss. The thing with the stock seat is, you can almost sit as far back as you want, since there is almost no hump for back support ,, ect.
BTW - I am 6'3" and with Legends and Rumble there is plenty of room
Kyle