Yamaha centre motor rated 70Nm - any issues?

[danfoto]

One of the two contenders to replace my 2012 Kalkhoff is the Batavus Harlem Ego which uses a Yamaha crank motor rated at 70Nm about which I know nothing. Is is reckoned to be good, or does it have "issues"?

 

[Samcycles]

I had an extended test ride of a Haibike sduro 2.5 street with the the Yamaha PW motor. I don't know if there are any known issues with it but I found it responsive with plenty of power on the hills. The only thing I could say about it was the sound of the motor was much more noticeable than the Haibike's with Bosch motor's