The pros: The book is a good mystery. Frank Herberts writing style is hard to put down, and he delivers in this book yet again.
The Cons: This book seems to leap right into the story, I didn't feel any setup, which will seem to conflict with my next thought... The book also felt inflated, like a twilight zone episode stretched to a movie. At the same time it felt to be a re-hash of other things, even Dune got pulled in.
Perhaps Frank Herbert had to work something out of his system. I had a hard time putting it down, and finished it in a day, but afterwards I didn't feel any deep connection to the book.