Yes, I have one and nolonger use it, decided I didn't like it that much as it's too draggy, but it is very stabble and gives quite a possitive feel.
My theory on it is that if you have a board with a lot of tail lift or is very sensitive in the tail then the lift that the winged keel thing gives is great as it helps to balance some of that responsiveness. Only one way to find out though....ah that's right onshore and no swell, back to mind surfing through the lineup thread