Servos
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Not all servos are created equal. The circuit boards, seals, motors, metal, and composites used in making a servo can vary from manufacturer to manufacturer. There are usually different tiers of servos within a brand to offer the end user and their budget.
When a servo is said to be "metal geared" it is not always all the gears that are metal. Sometimes a person has to dig deeper into the specs to find things out.
In today's world, I won't even think about putting a servo into a shopping cart unless I can find replacement gearsets for the servo. That's not to say the manufacturer doesn't have faith in their servos, to me it means the opposite. Gears wear out. Having an option to replace a gearset is a must for me. I'd rather do that than keep buying disposable low budget servos. Of course, one's budget may not be like another's budget.
So many servos out on the market today. Torque and speed specs to keep a person busy for hours as they shop. Coreless; brushless; titanium; high voltage; programable.... blah, blah, blah.