Remembering the Kanji is not a grammar book, it will not teach you how to actually read the kanji, nor will it teach you more than one meaning (called a "keyword" in the book). Despite that, what this book does teach you is incredibly invaluable. Remembering the Kanji breaks down 2000 or so of the most common kanji and teaches you how to remember them and write them. You won't need to write kanji over and over again in order to learn them. Not only that, but even after finishing the book the method used in it remains useful whenever you encounter new kanji.
I consider reading this book one of the best choices I've made in learning Japanese, and I think it is the best way to start learning kanji, or reinforce them if you already know some. Also, I highly recommend that if you buy this book you take a look at a website called "reviewing the kanji" an unofficial, though recognized by the author, companion website that provides invaluable help and support when going through the book.