I had the opportunity to test ride a Sport seat. The shape is very different than the rest of the seats, and is definitely designed for more curvy-bits time than cruising time. It would be great for someone that like to "get off" to the sides and hang knees low, as the sides are shaved to make it easier to do so. It has no "pocket" or even much flat area for your bum, so would not be as good a choice for touring.Is that the OEM sport seat? Never realized it was angled upward towards the rear, and flush with the pillion seat. That seat is supposed to be extra, right?