Like Paul Graham said in July 2009[1] The trouble with the Segway is that it makes you look smug. This thing will make you look even more so. [1]: http://www.paulgraham.com/segway.html
Really? I think it makes you look less smug. It doesn't make you effectively taller the way Segway does, and sitting is a more casual position. I think the people in this video look smug, for various reasons unrelated to the U3-X itself.
It looks like this only targets indoor super smooth surfaces, but I think it could definitely find a niche.