I think the state of cycling can be fairly well evaluated by the fact that StepTwin has raised $8,700 in 3 months, while the SpinCiti e-commuter bike has passed $400,000 in ~40 days.

People don't want a bike with two drives, that you "pedal" by looking silly. They want one that will go 30mph for the effort required to go 12mph.

That said, I'd like to try out the stepper thing at least once, if just to satisfy my own curiosity. Being limited to 18mph makes it pretty much "not for me" in the long-term.