This site is pretty cool. http://www.devsurf.com/ I saw their venturi bottom model in one of the latest mags. I would love to try one out. The bonzer bottom looks interesting as well. I have never ridden a board with so much going on underneath it. Channels yes, but nothing like this. I am wondering if the hard edges of the bottom concaves, channels and contours would create any lateral drag. I know the venturi theory works, but I wonder what are the trade offs with a board that has so many hard edges under it?