My one criticism is the total lack of comments for people like me, that are left handed. I know that most of the time I just have to substitute left for right but it would be nice to acknowledge that 13% of the population does actually exist.
It would also be good if the chords and diagrams could also be available for left and right handed people. Might also be nice to have a left handed instructor to discuss any specific issues that lefties may come up against.