I totally disagree with the other reviewers. I bought the book on the strength of their positive comments. Big mistake. This book has no explanation of pronuciation, tones, grammar, or language usage. Example:
"Have you eaten yet Mr Iu? Iu sian si ciaq-pa bue"
How would you know the pronunciation of these words? How does the romanized system work? What is the the grammar structure? You won't find any answers in this book. In Taiwanese they say Iu Mr. the other way round to English and usually put the name at the beginning of most sentences. Again different to English, where don't always use peoples names. Also, have you eaten yet is equivalent to the English, "how are you doing?" or "how are you?". It's not an invitation or suggestion to get some food. There is no valuable info like that in this book.
To cap it all, the language it uses is very old fashioned and different to how most people use Min nan hua in Taiwan today.
Sadly, I agree with the reviewers on one point. There are almost no Taiwanese language books available :O(
I taught myself to speak and read Chinese successfully, but I won't be able to make any progress in Taiwanese with book like this.