I also agree. The CD displays the printed notes on the screen which in the end, you have to hand anyway. One benefit of the CD is that the tests are included and I found it less 'tempting' to cheat and look at the answers if the books are away on the shelves. ( Yes I know I'm only cheating myself but ..we're all human!!)
Also the diagrams on the CD, especially the moving ones, are very good especially for gyros which I couldn't get my head round in the books. One look at the computer and all was clear. For the second module I didn't look at the CD at all ( apart from the tests).
Hope this helps
P.S. the CD needs to be installed on a computer and once installed I don't think it can be reinstalld on a second computer. Something to bear in mind when using it.