My wife & I are not real wine experts but we have visited 3 other wineries in the same Delaware area and found Sand Castle to be the best. We visited this winery about 7 yrs ago when they were completing the "castle" and enjoyed the wine testing back then. The "castle" sits on top of the hills over looking the Delaware river and the view is fantastic! One of the few wineries with a large vinard that you can tour. The wine testing is fun as you taste 12 wines with some chocolate. They also had you taste a wine warm (spice) and in a cold pitcher like you would have on a hot summer day.
One issue, we were included with a large group of people and the tasting area was in the same location as entrance which made it noisy. They did not seem to have enough people working to handle all the people. The wine is good - not great but this is PA on the Delaware river not Napa Valley.