I saw these in the supermarket the other day and only bought them because they were advertised as being 30% off (1.38€ for half kilo). I like grapes, they are great with a platter of italian cheeses and nuts, but as an everyday snack, grapes are not my favorite fruit. Midnight Beauty changed all that as they are the sweetest black grapes that I have ever tasted anywhere, and they don't have seeds!
I found out that these were developed by the agri-business company Sun World under registered trademark which means that growing them in my garden will never happen. No seeds, no seedling, and being a hybrid guarantees that I wouldn't get the same plant anyway.