I agree with this. I've been using three different Hitec HS-81MG (metal gear) servos. They are cheap, metal gears, fast, sufficient torque, and lighter than other 12th scale servos. I saw "metal gears" and thought I was good to go. What I failed to overlook was ball bearings. My HS-81MG servos are all working fine but the problem is an increase in play. The servo head itself gets sloppy over time. Even though the servo saver is firmly screwed on tight, the whole metal servo head is sloppy. This causes a lot of front end play.

Lately, I changed to an Airtronics 94145Z and couldn't be happier. This thing is smooth and rock solid. No sloppy play anywhere. I really like all of the ears (6 in total) that come on this servo. It gives you many different mounting options.