The big problem is the book itself: As and when I read the pages tore. Having finished the book, I find myself with the blanket in one hand, and over 250 loose sheets in the other.
The concept of the book is to study and reread it several times, so I'm very annoyed.
The very cheesy cover is also a downside, but it's nothing compared to the problem that I encountered.
The pages are just glued to the binding (with very little glue), so do not open the book too if you want to keep it as such.