Actually I have tried 100's different juices.. nothing comes even close Dekang DK-TAB for my all day vape.    I also like to vape coffee.. Not Coffee mocha Creme blah blah... I just want black coffee... you know how hard it is to find a simple flavor in American made juices? So i vape Dekang coffee.   
American made is great, I buy Rawr, AV, Mtbakervapor, myfreedomsmokes, top vapor, bluemist, Atomic, etc.. all the time.  I have 12 mods each with a different tank with a different juice the only one that is contently filled is DK-TAB @ 24mg.  All day everyday.  I go through 150ml in a month of just DK-TAB and it costs $10.00 per 50ml at madvapes.
Some American made juice makers use Dekang as their base.  Which im not against...