[MetroMPG]

Pedelec requires the rider to be pedaling in order for the controller to send the juice to the motor.

I don't know the details of Golden's approach, but some e-bikes (BionX comes to mind) actually measure rider effort (strain gauges?) and motor output changes in tandem (nice pun!) with the rider.

Regen causes the motor to act as a generator under braking, which puts some electrical energy back into the battery when slowing down. Since bike riders in general don't use their brakes nearly as much as hybrid car drivers do, I'd question spending more to get an e-bike with regen.