I am on the completely opposite side of that...I never want to use my Vivi Nova again after using my new Protanks. Flavor & vapor production is way better than it was with my Vivi Nova, it looks a lot nicer & it is pyrex rather than plastic. For me, this solves all of the issues I had with the Nova without having to modify the gear.I had two of them and went back to the vivi nova's and sold the protanks. I did not see much difference in taste and I hated the mouth piece. Lots of folks love them though but I am hoping they come out with a v2 with a removeable mouthpiece. Perhaps I did not give them a chance to break in. I went through about 3 or 4 tank fulls and was not overly impressed, but that is just my two cents.