Used my iS90 a couple of weeks ago in six, high-speed slalom races and it felt really good. Quite windy and flat water, so rigged it with my 6.2 and a cut-down Venom 34 fin. The board had good acceleration and heaps of speed (managed to do 35 knots while racing). Took a bit to get used to the way it gybes, but overall a big thumbs up. I've kept my trusty old iS86 and am glad I did as the 90 feels like a full step up, size-wise from that board. I hope to be sailing the 90 mainly with my 7.0m and more in open water than I would my 86. Also have the new 110 and have used that a few time now with my 7.0 and 7.8 and it feels great.