In article ,
lid says...
nothing lasts forever, but the good ones should last a very long time.
unfortunately, some are not particularly good, possibly counterfeit.

A friend and former colleague is a very experienced EE who
works independently as a software and circuit designer and
also writes technical articles on computer topics for
magazines that you and I probably read (and journal
articles we probably don't...). I have asked him the same
questions about these gadgets. His response: "To a first
approximation ALL such devices on eBay are counterfeit."

Be careful. Buy them from places like Newegg or Frys.