Can't tell too much about the terroir impact of grafted vines from such a small sample, but fascinating history nontheless.
It certainly enhances the experience of drinking the wine, which is why we often drink wine with our Hugh Johnson Atlas open in front of us--same reason you go flying around with Google Earth. The more you connect what you taste to what you know, the more meaningful the experience.
My wine shopping and I have never had a problem. Just a perpetual race between the bankruptcy court and Hell.--Rogov