This is a good review that compares the Naish s25 5.3m wing and the Ozone Wasp 5m wing - out of the two the f-one very similar to the Wasp in that it is very light weight, has a very stiff shape, and excels in low end power.
Also, here's a review of the 6m s25. It's 56 minutes long

so that might be a bit much, but if you've got time on your hands at the moment it's worth a watch as he gives some really good advise on light wing pumping technique as well.
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Good stuff ... had seen the first one ... 2nd is great ... I have only tried the slingwing 4.2 in not enough wind ... looking for options as I do not like drifting downwind. I would love to have know the windspeed for the 2nd ... looked very light and almost drifting at some of the vid.
Thanks!