Instruct: Classify the given review as either positive or negative.
Query: Hard read!

Maybe my IQ is just a bit lower than others, but I found this book a bit difficult to read.The preface/intro for the book did not really provide much of a intro on how to study the book. And I'm not sure how the text combines with the student lessons.Also, I think the book delved too soon into the "deep" stuff without much background.