Can't see vids for some reason, but i rememebr in a billabong big wave surf dvd i had, they were surfing with a hydro foil, and then when i was in maui, there was some dude windsurfing with one.
this guy i know has one of those things, i think its like the craziest sport in the world, you can boost high as fuck, wwayy out into the flats, and he can do like 20 backflips right in a row, crazy shit
like halfway through the first video when they're taking the boat out or something you can see the tower. it's a normal tower with like a 2 or 3 foot extension.