Not been but an old ear from work swears by it. Quite cheap still but not sure if it's going to be your cup of tea nowadays.
There was a program on a year or so back and it showed the authorities are really clamping down on its hippy/party reputation to the extent where you can now get severely nailed for a having a bifta.
It showed a group of chaps who had been there during its party heyday and tracked them around as they went over all of their old haunts now smashed to pieces by the police. On the night of full moon they searched in vein for a party only to hit dead end after dead end and when they did find something it was raided and stopped within an hour.
http://travelmax.statravel.co.uk/sisp/?fx=event&event_id=78789Although New Years may be a good bet, see above.