A warning? Because of course people are going to watch this and say "I feel like jumping over the edge of a building now and try to catch myself on a latter. The commercial doesn't say I shouldn't..." If people are that stupid....
These are not new at all. They are very heavy. They made a different board with the same idea, but it works much better. It has 3 wheels on each side, with the middle wheel a little farther from the board. Called the Freeboard. http://www.youtube.com/watch?v=IFHkA2J-2Tw