A good mixed impression ...

Textual extensions to cycle and thus, subsequent to the death of Herbert father.
In other words, it comes to texts written by Anderson and son Herbert and therefore are patches to the original cycle, Kinds of prequels, here fourth volume attached ....

On the substance, I would say that from the point of view of the plot, the narrative is not so badly done.

There are a lot of twists and turns, the universe is dense (I mean thick actually).
There is also an undeniable sense with manicured scenic and generally evocative descriptions. A well measured gravity, which generally saccélère, which is getting stronger, which causes the readers in close proximity to the themes, situations, applied history of this universe and characters ...

However, all these events are highlighted, and work much like a pearl necklace, a pearl after another. A blend that gives a pretty shade agreed to the text.
Overall there is also a position that is naive and increasingly broken candy sandstone narration.

I think the ideas are good: the structure of the characters, the universe, and a healthy taste for the action and for the spectacular.
Laspect machine is fairly well established, enough to affect the player.

However, a little too naive, too simplistic at different levels make it a partially disappointing text, sometimes bulky, a little too easy.

So here I am stuffed dune good mixed impression ...