I have a Corbin Young Guns like the one at the top of the page in the NewR3 ad. It's very uncomfortable for the passenger and I was having to switch out the seats to either the stock or gell seats when the wife wanted to ride. I'm most comfortable on the Corbin since it's firm and broken in so neither of us was as comfortable as we could be.
Problem solved when I got her a Butty Buddy, sounds goofy but it works great. She loves the added size and height, she is comfortable and can see over my head where we're going. I like it because I can take it off easily and have the seat I like and that looks best at any time home or away.