This book is indeed a pain... I mean, it's not difficult at all, only a little too long. Most of it's pieces sound a lot alike and might really not teach you anything new, depending on what you've already seen before.
In my case, most of the exercises are only being studied quickly, while focusing only on the most important (for me), according to my teacher, of course.
If I had to go through the book by myself, I would probably just end up giving up on it, because most of the etudes are really boring.
