We went last year. The food festival alongside the 'campsite' was pretty good, and the location was great for walking in to Chester town. The facilities for camping however were very poor. Nowhere near enough toilets, they were not cleaned and completely ran out of water several times - both for flushing and hand washing. It was also noisy at night.
I live in chester, but heading down south this weekend *if* you do go out in chester, try "death by tacos" probably my fav food spot in chester. "That Beer Place" is decent as well.