So basically they're saying "Oooooo look at this cool design. With a design that shiny, how could our CD EVER be a ripoff?"

To me it sounds like one, you have BUY something available only on that site, and once you buy it all it is a CD filled with the sounds of certain notes, and then they expect you to find them on your own guitar. I wouldn't do it, not when there are free lessons like

or even

But that's just what it sounds like to me.