I have this book too. I found that it made me too lazy to explore my own meanings of the cards, or to do any study, so I put it away. I got her workbook which enables you to come up with meanings in the categories that she uses. That was when I discovered that the laziness was really an attribute of me, and not of using Garen's book.
These days I do use her Spiritual Guidance spread from the Tarot Made Easy book. I love it ... but I don't use her meanings any more.... unless I am really stuck. It is a good book to help you grasp the multitudinous meanings that cards can have depending on the question. What it doesn't do is help you become an independent reader. It is too easy to rely on it, and not risk yourself in the process of reading for yourself and others by which you learn your strengths and limitations as a reader, develop your own skills and confidence. Nor does it help you explore the cards in relation to one another. Still, you can't expect one book to have everything.
I rarely read the cards ... it is not my area of tarot interest ... but I would never part with this book. So for all my criticisms, I do recommend it.
mythos