I can honestly say that WE have not noticed anything that we could directly attribute to the Ionized Water ... but before we got it we drank mostly distilled water with greens and oxygen/alkaline drops added. And, we have had a VERY hard year and a half.
So ... it is hard to say. Anyhow, you CAN feel the difference in the water when you drink it. But that is sort of anecdotal/intuition.
Like I said, if you really want to try the water w/o buying a Jupiter, then you could try Prill beads. I have heard they do the trick.
I am going to get some myself, for traveling, etc...