Interesting concept for sure.... but, I noticed when watching the video how often the women on them kept touching their toes to the floor as if they weren't balanced well, or it could just be not comfortable riding it. Also, how it never seemed to "sit still", there was always movement even if it was slight. This will likely be way over priced if released and really not that useful anyway to the consumer(much like the asimo robot), but these technologies seem like they could be useful, be it for future robotics or medical applications such as assisting handicapped people
Another question I would have is, when the battery runs out does it just dump you on your ass?