Word of warning, the entire series of books should be considered the six books written by Frank Herbert, not any of the poor worse-than-fan-fiction by Brian Herbert + Kevin J Anderson.
I read a few of those and it's just like reading later Sherlock Holmes pastiche. They both capture the setting and the mechanics and completely exorcise the spirit. It's almost sad to read things like that. It's the wish that the author had written still more in mortal conflict with the fact that he didn't.