This was the main reason why I opted for the MVVS80 rather than the DA85 for my 97" Zero.
There were several reports of people having to strenghten the airframe and buy better servos for the elevators if they used the DA85 and I also liked the lower RPM torque from the MVVS
I also used to have a ZDZ80 in an earlier plane some years ago. Very smooth running and strong engine.

I heard there was an upgrade or a modification available from DA for any 85 older than certain serial number to address the vibration problem?