Some of the advice is simplistic to the point of being misleading if followed unthinkingly. For example, on page 62 it states "Even if the text is clearly structured, it may be difficult to read it if the lines are too short. But where there is only a small amount of text, as in picture captions and notes, short lines are perfectly legible". If you read this out of context, you might guess that you can shorten a line of text as much as you like and it will still be legible - but of course this isn't the case. Imagine a 12-character line for text with words like "incomprehensible" or "extra-terrestial" (both 16 characters).

I'm also concerned that the book makes almost no mention of the purpose of the text, even though this has a profound effect on the way it is read and therefore its legibility. The screenshots are nearly from sites with large amounts of graphics and small amounts of text. Different considerations apply to information-rich sites that will be read for their content, for example an FAQ.

I did like the illustrations of the same font in different styles and on different backgrounds. These really help to show how a choice that would look great on paper can look awful on screen.