That looks extremely stupid although I'd love to see someone go up a steep hill or fast decent on it... could be entertaining.
Wouldn't your neck get sore from always having it turned the one way? Also your field of vision would be limited to the one side.
how about using it as a fun vehicle? i don't think it is very nice to go up hill with skates but still people use them.
That guy needs to wear longer shorts in his videos... There's a lot of chain in that to make the wheel turn; very impressive design from a mechanical point of view.