It depends on who makes them and yes there are very bad ones. Some good ones are just as good as the authentic but minus the authentic price tag. Tobeco IMHO make good ones. Some of the problems faced on badly made ones will be the O rings are too thin and too loosely fit, the insulating plastic used is some cheap material instead of delrin hence melts after a few use, screws strip easily and worse after you tighten your screws while glowing your coils, your ohms keep jumping around for no reason.
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