Hmmm, kinda' reminds me when I go inner-tubing on my belly behind a ski-boat-- same body input to steer. The difference with the roller-wheels is hitting a pot-hole, road diviation, miscalculation of a corner, or equipment failure would pose a very stiff penalty; and the penalty for an error on those roller-wheels is death!!! No thank you, I'll stick to water which is a lot more forgiving.