It sounds like a good concept, and I can see the technology advancing. It seems like there is still more effort required on the part of the rider. That can be a good or bad thing, depending on the type of rider you are, I guess. Some assist on a short hill would help many people, while still providing more of a workout pedaling on the flats. It would be interesting to see the available watts/hour output of the supercapacitor pack, as well as the weight vs a comparable li-on battery pack.