Traditionally there are two ways to learn how to play the guitar - buy and read a book about it, or hire a teacher. Hiring a teacher is expensive, slow, and often inefficient. Buying a book is cheaper and more flexible - but there is only so much a book can teach you.

You can learn most of the concepts and ideas from a good book, but personally I need someone to explain it to me to really understand. Without someone to actually teach you, what you're effectively doing is guess-work (informed guess-work, but still guess-work). Surely I don't need to tell you, what a waste of time and effort trial and error really is.

With downloadable video lessons you have the best of both worlds. You can choose when and where you want to learn, and you can choose your own pace - just like with a book. Plus, you have someone actually SHOWING you how to do things - like having a private teacher.