The original Dune series (not the hack prequel written by his son) is an incredible synthesis of environmentalism, religion, economics, drugs, etc. I reread the original series at least once every year. From a writer's point of view Frank Herbert executes incredibly on several levels from world development, characterization, plot, subplots.
The story extends over generations. It is epic dealing with prophets, Gods, demi-gods, cults, secret societies.
Each time that I've reread it was a unique experience. This time around will be another unique experience. I am going to do a guided Dune group reading. Basically if you want to be down contact me and we'll set up a schedule of us reading chapters together, discussing it through various social media portals, and basically giving a different depth to the work that one wouldn't get on their own. I'm planning to set it off on September 1st so get at me.