I see it's more of a blend
It seems hard to find a stand alone wine. I was worried about the wine quality.
Not sure what you mean by this? Do you mean that, generally, Petit Verdot is used as a blending wine? Yes, this is true, but not for the usual reason, that is, the reason that, say, Grenache or Carignan(e) is used in blends.
For Grenache or Carignan(e), those grapes may have high yields, and can be thin when grown that way. Thus, they are used as a cheap "filler," and are blended with something with more backbone to fill them out.
Petit Verdot, on the other hand, is a very robust grape -- lots of color and flavor. It has been described as "Cab Sauv on steroids." Thus, it is often blended in small amounts (< 10%) to "pump up" a thinner wine, especially to give it more color. Long ago, I heard a winemaker say "PV is like garlic -- very tasty, it really enhances your wine, but a little goes a long way." You do NOT need to worry about the "wine quality" just because it is often used as a blending component.
I like big reds, and so have always wanted to try a single-varietal bottle of PV, but have not done so yet. Others here can tell you more about the experience. In any event, the WE kit is definitely in my plans at some point!