Best: Kylie Minogue, Paul Keating (!!!). Jimmy Barnes was pretty nice.
Worst - Hazel Hawke (ex-PM's wife) - a right nasty bitch. Aerosmith - a group of precious has-beens - refused to talk to punters, sign autographs etc. Actually requested a crewmember to stand at the F/Y bulkhead to ensure that no-one would walk past them
I've also heard the same stories about Elle McP.