I found the book to be well-organised and easy to read. All sections are written in a clear, easy to understand manner, assisting the non-scientist layman in writing convincing science fiction. One of the best features, in my view, was that the authors point out all the "wrong science" blunders common to science fiction, thereby helping you to avoid them. They also point out examples of excellent science fiction and how those authors used known science in a convincing manner.

The only significant shortcomings of this book relate to its age: it was printed in 1993 so the science risks becoming dated as we move further from its publication. Additionally, this means that it has gone out of print and one can only obtain used copies. However, there is nothing newer out there that covers all the areas that The Writer's Guide to Creating a Science Fiction Universe so it is still well worth it.

I have also read the Science Fiction Writing Series (edited by Ben Bova) "World Building" and "Space Travel" and I preferred The Writer's Guide to Creating a Science Fiction Universe. There is nothing wrong with the Bova books, they were excellent as well, but I found Messrs. Ochoa and Osier's book easier to read and more insightful. Plus, it is nice having everything in one place. On the other hand, the Science Fiction Writing Series books are more comprehensive and still in print.

Definitely a worthwhile book.