What do you think about the Airless Car Tires, Tweel?

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So I was on you tube and I came across the Tweel video about the new car tires that don't require air. Instead it has flexible "spokes" going from the rim, to the edge of the tire. If I could copy and paste I would put a little article.. instead, just Google Tweel and you should find what it is. I'm just curious to what you might think about it, and what your thoughts are on the Pros and Cons.