Vodka from wine grapes -- be they French or Californian -- is nothing new. "Silverado" Vodka was made from California wine grapes back in the late-1970s or early-1980s.
Vodka is distilled as a high-proof neutral spirit. It is TRADITIONALLY produced from either grain or potatoes (take your pick -- it was either "invented" by the Russians or the Poles, too, but . . . ). But the fact is, as "AlaskaChick" said, it IS one of the only alcoholic distillates than can legally be produced from anything.
In theory, because it's a *neutral* spirit, it should not matter from which raw material it is distilled, but rather how it was distilled and how it has been filtered. In practice, some aficianados prefer vodka made from grain, while others prefer vodka made from potatoes.
I don't know anyone, however, that has prfessed a preference for vodka made from wine grapes.
Let me quickly say that I have not tasted Idol Vodka, nor Ciroc for that matter. But my experience is that vodka-made-from-grapes generally comes onto the market whenever there is excess wine available and the market seems to have forgotten the previous attempts at introducing the last vodka-made-from-grapes into the marketplace. Idol (or Ciroc) may indeed be very good vodka -- as I said, I haven't tasted it -- but there is no doubt in my mind that it's driven more by marketing than it is by quality.
I'm not familiar with this brand but have had Ciroc which is made from ice frosted grapes. Can't tell you much about the process but vodka is one of the few, if not the only, liquor that can be made from any grain, fruit or vegetable. As a vodka snob....I love the Ciroc as it seems smoother than just about anything except my "straight from Russia - can't read anything on the bottle" vodka.