Just wow. One of the few movies that lived up to the hype and visually it is one of the most stunning films I have ever seen. The whole scene on Giedi Prime is otherworldly and sets the Harkonnens up as a malevolent force that is the complete opposite of the Atreides we see in the first film.
Only complaint is that while the first part was 99% faithful to the book, part two drops to about 90% and also cuts out what I think are pivotal scenes in the book. Still it was never going to be easy to choose what to drop without turning it into a 4 hour movie and overall it all works incredibly well.
I was just reading about that Geidi Prime scene, I just assumed it was digitally altered to get the look, but apparently the whole thing was shot using infra red.