"I have a Qualisport Dolphin for little over a year, about 750 miles ridden.
Combination of 350w motor & 20" wheels do offer enough torque to get going from stop and keep a good pace at 20 mph, but not much above 20 mph.
But I like the stronger wheels riding in NYC, where potholes and poor road surface can damage larger wheel frequently."
IS there a limit as to how low you can put the seat on your Qualisports? I saw a review on the Fiido, which uses a similar seat tube battery and the guy said it's no good for anyone under 5'8" because the seat post hits the ground.