This is the best instruction/ music/ tablature book I've purchased. As an iOS user I was a little skepticle of the campatibility. I downloaded it & had to add the PDF to iBooks & the audio to iTunes. I had to assign my own picture to the audio portion. I had to then sync my devises to get them onto my iPad Air. On my MacBook the music doesnt all fit on the screen and I have to scroll to get around which doesn't work while playing. The music does fit on the page when using iPad. I like how it has the music and tablature & what really makes this worlds better than others is the audible recording which really help & are nice to listen to even when not practicing. I have no real complaints about this product but in the future I would love to see this as a native iBooks book. These days you can have a book with easy audio & video access as well as allow the user to make notations and highlights as well as being able to easily jump to chapter/ sections or songs. And it could be so much cleaner, intuitive & efficient. It could even be inproved with videos. Also users would be able to easily add content to devices without having to manually add stuff to a computer then import it into programs then sync to each device and ofcourse that purchase would be protected by Apple's iCloud. There isnt anything like that available on iTunes & I bet it would be very popular. But even if it was a simple iBooks version it would blow the compition away in that eco system.