Do you guys treat it as your main music player or simply duplicate whatever is already on your iPhone and iPod? Because I see all these posts where people say they bought the 64GB version because they need to fit all their music. I carry all of my music on my iPhone and can't imagine putting any tunes on an iPad. It is just simply to bulky to carry around as a music player. It also seems kind of a waste of space by putting music on it when it is already on my iPhone. Or is it when you are browsing the web or reading a book that you like to have all your music all coming from one source?