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ALL of the vib tumblers use cheap shaded pole induction motors, exactly the same ones used in kitchen stove and bath vent fans. No tumbler maker does their own motors, they all buy them from motor makers. Any single production run will have some really good motors and some really poor ones. Attempting to draw parallels on the quality of one of those motors by looking at the color of the bowl is pointless, luck of the draw is all that makes a real difference, good or bad. Get a cheap tumbler so you won't lose much if it does burn out quickly.
Pull the bottom apart maybe once a year so you can put a few drops of a quality oil on each of the two bronze bearings and most of them will run forever. If the power wiring breaks off a motor, reconnect it and keep going.
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