I have been!!! On thursday! without children, and I am going again on saturday with children and some MNer friends. It was fabulous!
We shall come back and report fully on our experiences after saturday, but in the meantime, here is a link to a thread I posted on MN general - put it there so those who visit plymouth from time to time get to know it is here, and visit it, as well as those who live in this area - it is a great asset to Plymouth and I want it to stay!