Im about 4 hours into the course now and have the first book in Jeremy Pratt's series. I find it easy to read and the diagrams make the explanation easy to understand. (The diagrams show you what the controls are doing with a caption below). All in all a very good buy.
I would suggest buying them from Play.com if they have them in stock. Amazon are cheaper but Play have free delivery (This last point may only be applicable if buying them as you go!!)