It's a class 1, so it will assist up to 20mph. I typically cruise at around 15mph on my own (I'm in a similar weight class as a rider). For getting around my town, trips are not much longer than my car.
So, how does it do on the occassional hills of a Chattanooga (e.g.)?
I'm about to visit my local store, which has one in stock, available today.