I think it's a lame idea.
But then, I'm an investor in an electric bicycle company.
We think electric bikes are better because
1. you can go twice as fast
2. you can ride it like a bike if you want, or combine propulsion modes
3. you can take it with you because it's about 45lbs. as opposed to about 85 lbs.
4. you dont look like a fool using it.
http://burro-zvobikes.com/