I've got a Kona - extremely versatile board. Excellent in the 15-20 knot range planing, and reasonably nice in say 8-12 knots cruising with a 6 to 7.5 m sail. It won't plane nearly as early as a Formula or even quite as early as a big freeride will, but it 'slogs' way faster - but not nearly as quick as the Serenity. If I lived where the wind was seldom over 10 or 12 knots, the Serenity would be way more fun I'm sure (I've never sailed one yet). The Kona is pretty bulletproof too, whereas the Serenity sounds a bit fragile - I expect it feels a bit like sailing a violin - I doubt you want to try chucking it around. Must be great to take on keelboats in light airs though! Anyone done that yet?