Yes in your case where you have an original one they were made better.....
For those that have had the pleasure of dealing with the inferior made Chinese knockoff parts, they do go bad and burn out. Not because of the original design but, shoddy soldering, bad wiring, over all bad quality control........ No they are not supposed to go bad quickly but they will and do...... If you get lucky then by all means keep it. Sometimes you go thru 3 or 4 of them till you get a good one.
I finally got a good one and its been fine for 3 years so far. But went thru a couple right away that we're bad. My buddy who's a Mgr for the local parts house bitches about this issue with a lot of the Chinese made or rebuilt parts.... They get a lot of returns.