Many things in this little book are frighteningly so true.
Entertaining, well observed and fairly evaluated from the Western cultural perspective (so I think - I'm a Japanese living in UK since 2000).
It's not really a 'guide book' as such. Instead, it gives you a brilliant cultural comparison, their mentality and the physical environment (climate, geography etc) that affects their world view.
If you are planning to visit Japan for a few days, this book won't give you much useful information, but, if you are going to stay there for more than 1 month and hoping to mingle with local people, this book would give you some subtle but really important insights to the 'why' of their behaviours.
Best read with your own 'Xenophobe's...' to get a benchmark. (I read 'the English', 'the Italian', 'the American', 'the French' and of course, 'the Japanese'.)
Like any other value system, the Japanese culture was like an invisible & odourless gas that I was breathing without knowing it - till I read this book.