Get the PDF version - tablet friendly, more pages, expandable graphics, low fat, no animals used in manufacture......
If I'm allowed to mention, there is no catch - the course notes are there anyway and were developed for another reason. It is a simple repackaging job, and the customer gets the benefit.
I would keep the other notes, however - they are out of date, but the basics never change, and it's always good to have a second view of a subject. Other explanations may not necessrily be better, but are often different enough to help you remember. Certainly ignore the ops and air law chapters, though.
I would also mention, if you get the book, that anything marked in a distinctive way (italics, bold lettering, bar down the side) has relevance to a known question, although it won't be the actual question, of course.
Phil