I've bought quite a few used motors from ebay, rctech, etc. Never had a problem with any of them. Some I have sold right back on ebay and now someone else can enjoy them for a third the price of new. I like to buy my batteries new so I know what they have been through. Batteries are much more likely to take a crap than a brushless motor although I feel a lot of sellers are dishonest with how much use is on any of their electronics.
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