Yes, we really enjoyed Sandra Bowern on our MC-Dover cruise in 2006. Too bad.
Our recent experience of the "get a free cruise and speak" on the PG was not so good. Mark Eddoes, the amazing archaeologist who is often on board was not--they have an art historian who specializes in Paul Gauguin instead. Everybody seems to love her, but I did not. But I'm still trying to figure out what subject I can lecture on that will get me a free cruise!
Really, if they were all like Mark Eddoes, I would have no problem.