Me too, now...
I'm now also in love. What an awesome idea! My biggest issue with electric bikes has always been the fact that you don't have to pedal, which this now solves.
I'm wondering if you couldn't rip apart one of their production bikes (or two) and build something similar. It sounds like basically just an issue of two motors instead of one, and programming. I also don't understand why they don't use more batteries.