It was our own sweet Terry who told me this. She has many Phiniacs because they are better. They cost more, of course, but you get what you pay for.
I have found, since switching to glass (via a very generous gift to me) that Plastic changes the Flavor of even 100% VG. This is why I hate the Vivi Nova I have now. JJ has a metal one for her Cinnamon. That might be a way to go. But I really like being able to actually see the juice level.
Take a look at this, then - metal tank with window: not sure what the window is made out of, however.
Big Daddy Vapor



