China are also the world leader for manufacturing balls and bearings, so why would you expect them to be rubbish? Provided they come from a reputable manufacturer they should be of good quality. Probably over 75% of bearings in rc kits will be made in China, and most last pretty well if they are maintained. As said earlier in the thread, it doesn't matter what spec your bearings are, if you don't maintain them they will fail.
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