I've seen this e-bike and, I admit, it's one of the best out there. A couple of caveats though:
- The 15 to 20 mile range is a very broad estimate, based on "normal pedaling", ideal (read light) rider weight and, I would guess, level roads.
- If I bought it and used it to commute to work, I'd have to talk my boss into letting me plug the battery in someplace. That didn't seem a likely thing.
- Yes, I admit this too, 15 mph is a bit slow for me. And the other drivers would either honk at me or try to run me off the road. (Wait...they do that now anyway. Never mind.)
All that said, the I-zip looks like a great bike for an electric. If you can make it work for you, I'd go for it.