We have now shipped almost 20 versions with the new stepper motor. And the feedback is great. The only disadvantage is perhaps the increased power consumption from ~180mA to ~900ma. But in times of regular powerbanks having at least 10.000mA or 20.000mA capacity, nothing to worry about.
All in all, it was worth doing this redesign.
Ahhh, and almost forgot to mention. We already did two conversions from the older encoder-version motors to the stepper version.