I just bought two new 08 GTX's 215's, after looking over a few threads i'm starting to wonder if the supercharged is even worth it.. I looked over the site at seadoo and I see specs, but the overall question that pops into my head is what is the performance difference. I'm taking my new skis out in the morrning what kind of top end speed can I expect and what would have been the top end speed of the gtx 155 ?