I've been twice, the first time was on a short ghost walk, the most exciting thing that happened here was that someone saw a shadow cross the doorway in the ramp room. We did here some footsteps comming from up above use as one point, but we where told later that some school kids where having a sleep over!
The second time i was on a all night ghost hunt.
If the chance ever came up to go again i would go! The last thing i heard was that they were in the process to see if they could get permission to talk groups into the other mills and the forest, but since that night i haven't heard any more.