This was published fairly soon after "God Emperor of Dune", and as such only covers the first four core Dune books. It's utility waned when "Heretics of Dune" and "Chapterhouse of Dune" were published..., and officially became non-canon once Brian Herbert started spamming the sci-fi world with seemingly infinite amounts of "Dune Lite" material.

As such, this book is now a bit of an anachronism, and perhaps best read/consulted as an after diner snack after feasting on the main course of the first four core books. Anyone purchasing this at an used book store and unaware of the publishing timeline might be disappointed how this doesn't fit the last two Frank Herbert Dune books -- and how Brian Herbert ignored this source material altogether.

But for a fan of the core four Dune books (the best of the bunch IMO), this is a really great add-on to have a thumb through when you want to get your fix.

A wonderful companion, if often non-canon. Filled with a lot of enthusiastic writing that is sure to delight fans

After many years of reading and re-reading the Dune series (through God Emperor) I've concluded this: the Dune Encyclopedia is the best reason to have read these novels which, while variously awesome, excellent, and interesting, are never quite as magnificent and fun as this.

This is a must-have for Dune fans. It deeply explores the Dune universe and offers definitions and explanations about even the most obscure Dune-related fact. For example, it offers a fairly in-depth look at the Fremen language.

Unfortunately, this book has been out-of-print for many years now and it is very difficult to come by. I bought my copy off of E-Bay, but it is usually very pricey to find.