I like the Leaf motor and I'm satisfied with its performance and construction quality. I have powerful, reliable and low-maintenance linear-pull brakes front and rear. My top speed so far on level ground is about 52 kph, but I usually cruise at 30-35 kph with the assist level turned down to 2 or 3 (out of 5).
I don't expect very good range because I'm tall and heavy, over 2 m and about 200 kg total including the bike. Riding as I usually do, in city conditions with lots of stops, I use close to 25 Wh per km.
I have the 6 turn winding, but its rpm/volt is a little too high for 29" wheels. For a bike without suspension, like mine, I think the 8 turn version would be a better match.