Vintner's Best is not pure fruit - it's a fruit wine base with apple and other (non-grape) fruit flavor. It comes in gallon jugs that are meant to be made into 5 gallons of must.
Based on what I read from others who had used it, I shorted the water (approx 4 to 4.5 gallons total including both the water and the jug contents, instead of the 5 the directions call for) when I made some black raspberry and also some strawberry. They turned out pretty good; the strawberry was a fuller wine than the black raspberry, I think. I also have a full jug of apple wine base to use sometime.
After I bought them, I read the label and realized they were a base with the particular fruit flavoring; I thought I was buying fruit concentrate (such as Vintner's Harvest). I think you can get a good wine, but you might have to tweak the process a bit, such as shorting the water and/or adding oak cubes when aging, etc. The interesting thing is the label says it will ferment to 1.000 and they were right - that's all the lower it would go.