Another reviewer commented on each page being 40% margin. This is true. However, there are reasons this isn't so bad.First, the margin allows lots of space for sidebars, diagrams, and code samples. This is nice, because it helps keep the diagrams or notes close to the text it refers to.Second, the main text is set in a relatively small typeface, so you may not be losing much. It would be worse if the main text were set in 14-point with large titles.Third, the margin provides lots of space for you to make notes, or corrections, if you wish.So overall, I'd say the large margin isn't a major problem, though it *is* off-putting at first. At least the book is devoid of textual fluff, as is the case with some other technical books.