I'm pro electric vehicles for all kinds of reasons, and look forward to the day when somebody markets an affordable one, but this has to be the most rediculous contraption yet proposed. Why on earth go for self-balancing, when with the addition of a decent-sized front or rear wheel -- or even a pair of them -- you could cut the cost (considerably), dispense with the trolley wheels at front and back and design something that doesn't look like a Flintstones reject. The only excuse would be if it fitted with urban bylaws allowing it to travel places other leccy vehicles can't reach.