It's great! I'm just getting to the Ultra Q beginnings so have a ways to go in the book.
From what I've read so far though, simply excellent. Very easy to read and understand, lot's of cool behind the scenes photos and some really great stories from the sets of the movies.
One thing that keeps messing me up are the thick pages of the book! I sometimes think I've skipped a few pages and realize it's simply because the pages are cut pretty thick!
It puts a smile on my face every time I see the cover of the book with Eiji giving direction to Ultraman.