It works great. I was specifically looking for a bike without gears since I read that many people with e-bike conversions just leave it on one gear all of the time anyway and I didn't want the apparently-unnecessary additional complexity and failure modes of a derailleur.

Besides, the pedal assist power is adjustable so if I hit a hill I can just press the + button on the controller on the handlebar and I get more power. That functions like shifting into an easier gear, without having to pedal like mad to get anywhere.