Besides the firmness that keeps my ars from aching on long rides, I like that it sits me down into the bike more. The stock seats put you up on top of the bike while this one puts you down and more "inside" the bike.
The passenger portion isn't much good for anything but bar hoping but the Butty Buddy fits it really well giving it a wide, comfortable and higher seating position for the wife so she can see over my head.
It's the same seat seen on the NewR3.com ad on the top right of the page, I got the large alligator for the seating and small alligator for the tail with snake trim. It's held up very well and is as easy to remove and install as the stock seat since it mounts on the factory points. There is no alteration needed to the bike.