I have seen one flying around here before...I used to see it a lot but haven't seen it in awhile. One of the things that has always concerned me about those things is it looks like the wingloading on it is pretty heavy....IOW, high stall speed high landing speed. It also appears that way in those videos...you can tell it takes a pretty good angle of attack on the wing to get it flying. A hang glider can just about hover with a fair amount of headwind. Anyway, they are pretty neat and would be kinda fun.....