This book is very comprehensive, providing the absolute beginner with a good understanding of how the spoken language works in a variety of day-to-day situations and will form a good foundation for further study.
Though the book's emphasis seems to focus on polite levels of speech by means of the ~masu verb, it does a good job in introducing the plain form of verbs used in day-to-day conversations and shows their conjugation to the polite, and progressive tenses as well as giving a few examples in the dialogue where appropriate. All of the 75 verbs that appear in the book, along with their conjugations, are included in a table in the appendices for quick reference.
The 19 chapters are very easy to read and understand which aids the learning process. As such it is a book that can be dipped into lightly without the need for a dedicated 2 hour long stretch that more advanced text books require. Grammer is explained in context which also helps one remember.
As it's written entirely in roman letters, called "romanji," rather than the native Japanese writing system, it provides absolute beginners with an instant start in learning spoken Japanese while they learn the basic hiragana and katakana "alphabets" used in Japanese writing. There is also an English to Japanese and a Japanese to English dictionary at the back that includes all the words found in the book.
After working through this book I can now understand a bit of what I hear when watching the Japanese TV channels I receive via satellite (though sill not enough to know what's going on) as well as understand and speak a little to my Japanese in-laws without too many problems on a range of subjects. I'm still a long way from fluency but this has given me a great starting point.