Interesting. That looks to be the type of system I'd like to replace my Hilltopper front wheel hub.

Much as I like the Hilltopper for its throttle, the "all or nothing" power is not particularly encouraging to pedaling. It actually is harder to pedal when the surge is too committed to achieving 23mph whether you want to or not. Unless one feathers the throttle button constantly to just provide small bursts of power, you end up riding the bike as if it's a mini motorcycle.

My new Giant LaFree E+1 has a Yahama motor, and it is very smooth.

Can I ask what you paid for this system? (I did check out their <very poorly designed> website, and didn't find a price anywhere)