Unlike Dune, this series has been out of print for some time. Shame! No one does it better than Herbert but Dune-Mania has left too much of his best work unread and unknown. Dune was a masterpiece, no question. But the series devolved into action novels - the work of creating his universe did not have to be re-done so the rest was just what happens next (and as Brian continues the series, what happened before. The Voidship series is different. Beginning with Destination: Void, which establishes the premise, each novel must reestablish the world in which it is set. Each set of characters has very new hurdles and new forms of intelligent life(? at least self-awareness) to deal with, each with their own world view. A good marketing bet would be to reintroduce these novels in paperback, capitalizing on the popularity of the Dune series. Let the new generation of sf readers discover the other worlds of Frank Herbert.