Usual disclaimer applies. This is just my opinion.

Joanne, my things is this. Sure it isn't meant for me. However, this kind of "pseudo" learning tool allows people to sneak in under the musician club tent without paying their sweat equity. They may be able to learn the 4 chords it takes to play some song, but they didn't learn anything about music. Being an old school guy, I will cling to my death to the statement "Learn music. THEN learn songs." This tool provides a path to "microwave" learning. They can then start their "song book" without knowing ONE THING about music. About WHY those 2 chords are inter-related. Nothing about steps on a scale. You can't put a roof on a house with no walls or foundation. Well, you CAN, but will immediately fall to the ground.

I had a friend once tell me how much he loves cooking with food from those services that send you the components of a meal and directions about how to cook it. I laughed and said "So even in cooking, you are in a copy band. Call me when you cook that salmon WITHOUT the directions. Then you are cooking. Do you remember the directions when you try to cook it the next time? THAT would be actual cooking." That is similar in concept to what I am saying.

You want to play music? First LEARN music. Then learn an instrument. Then learn songs on that instrument. Otherwise just play CDs and sing along, because being able to mime a real guitar player is just that. Mime. Pretending. Acting.