In today's age of Internet and other Multimedia such as DVD and video downloads, Magic is much easier to learn now. The problem however is that less time is being dedicated by the learner to actually polish the things he/she have learned.
That's why in my opinion studying magic with a book is really better than most magic in multimedia format. Unlike most DVDs nowadays that are one trick ponies, books always have more to learn and most of the time gives better insights than most video downloads or DVDs out there.
Another thing is that when you buy a book on magic you are sure that it was written by someone who has the experience in magic. Unlike those videos which almost anyone even some inexperienced teenagers could make. I read reviews of some DVDs which were made by inexperienced people and my it was really bad.
As I have mentioned earlier most DVDs teach one-trick ponies that teaches how the trick is done rather than how to do it. With exception of very few DVDs that really teaches down to the smallest detail and advance handling, I think that most DVDs are just exaggerated to be marketed for some people's profits.
So now which would you choose? A one trick pony DVD easy to learn, hard to perform or a book that takes effort to learn but gives better insight for a better performance.