Sailhack said..
I owned a Shark, albeit an older model and it also was definitely lacking in speed. Not sure on the SS, but after owning a couple of JP xcites, I'd take a solid gamble that the SS would be a much more livelier and faster board than the Shark. The Shark seemed to be a very placid and easy to ride board, which is why I thought I'd purchase it. In the end, the lack of speed drove me nuts.
It felt like mine stalled at full-speed due to the footstrap placement and maybe the rocker shape? Can you demo the SS? If so, that would be the best comparison.
I'm from Slovenia - Europe which is a small mediteranian country and unfortunately we don't have test centers or test days for that matter. We only have a handfull of shops with windsurf equipment in the whole country ... To wait if some newer second hand board of this type would be available is a loterry so I decided to go with the JP SS PRO 118 2009. The price was 280 EUR with original mint condition fin and bag included. Board had some rapairs made so I took it to one guy that makes custom boards and does board repairs to check it out first. He gave me a green light. If I'm not happy with it I think I should have no problems in selling it. So now I guess I can wait for good forecast to test it out.
There is one other part of my original post that nobody has addressed yet - about the fin size of the smaller fin ...
G.