What's your opinion of the N+ booklet

in Network+
http://www.totalrecallpress.com/viewbook.php?bookid=21&session_id=
It's a pretty good price for it, I was wondering if any of you read it.
It's a pretty good price for it, I was wondering if any of you read it.
Comments
http://www.techexams.net/technotes/networkplus/pdf.shtml
What was your first source of study?