I first read Dune in 1984. I liked it a lot and later read and enjoyed the five sequels.
I love the way the noble houses are described in the original books. I love how well Dune/Arrakis is described. When I read Dune and the following novels by Frank Herbert I could see where the ideas for the nobles in Traveller has got (some of) its inspiration from.
Now I have read the last one of the Prelude to Dune trilogy prequels, called House Corrino by Brian Herbert and Kevin J. Anderson. This was an interesting book written in the same style as Frank Herbert’s Dune novels. This book focuses a lot on the Tleilaxu occupied world of Ix, where the Tleilaxu is trying to produce synthetic spice for the Emperor (from House Corrino). It is an interesting book, but I think that the other two prequels, House Harkonnen and House Atreides were better.