I bought a pro tank II and have had nothing but problems with it. I keep getting " rubber " taste and the taste is muted. Tried removing one or all of the flavor wicks, changing to different heads, re-coiling the head and still " no cigar " . My vivi nova kicks its ... . Im wondering if it isnt all hype combined with terrible quality control from china. Theres definately a problem with head pressure that the vivi sometimes has where you have to unscrew the bottom on the pro tank ( top on the vivi) and it seems to release pressure or vacuum that gets built up and then it vapes better, but the rubber taste is a deal killer. I say its a conspiracy from china...lol.. seriously .. you cannot tell me the engineers didnt have these same issues and chose to leave it that way so they can come out with version 3,4,5,6 .. just to sucker us into buying more. Some company in america needs to step up to the plate even if it costs more and start producing this stuff. Im glad I bought a Provari even though I like my Vamo for work..will NEVER get rid of my U.S.A made Provari.