most of the knockoff brands are almost on par with each other and not far removed from
joyetech's ego if you back track you will probably find someone down the line who made some of the same parts for both.
it's usually a wise choice and spend a few xtra bucks for the joye.
some knockoffs have been known to use lesser(2nds) cells for the battery. unless it's just a deal you cant pass up....................