Has anyone purchased the CD Rom Versions of the Service Manuals? I have found three so far. I know some enjoy the feel of paper and like to have the manual in hand when looking..any thoughts?

http://www.themotorbookstore.com/19chtrfashma.html
http://www.americanclassic.com/images/SM63CD.jpg
http://www.amazon.com/Chevrolet-Tru...UTF8&qid=1254794916&sr=8-2-fkmr1