I had lots of gear wear issues with 8611A servos. Those were my last JR servo purchase. In this particular servo the final output gear is aluminum and is driven by a steel gear. Recipe for disaster. Icing on the cake was the Horizon rep telling me gear wear was because of improper set up. He was pretty shocked to learn that those servos were pulled from a 40% Extra that at the time was the national IMAC points leader for the advanced class. He then agreed to rebuild my servos at no charge but we still had a long discussion about driving an aluminum gear with a steel one.