It moves along the story, but from the other replies to my comment, I didn't get Dune-pilled hard enough. =)

Its not bad, though, don't get me wrong.

For my money, I could have stopped at the third and probably would have had a pretty high opinion of the series. The fourth one, for me anyways, was interesting in that it had a very different tone but I was reading the books back to back and it felt different enough that it was jarring to my expectations.