IMO, most of these New anniversary issues are more about marketing hype than quality. All the "previously unreleased" music that is on the on the extra albums was unreleased for a reason. It's not good. This is my experience with Jethro Tull Aqualung that was done about 10 yrs ago. Admittedly I don't own many because I won't pay the exorbitant price they are charging. This is not to say that all remasters are bad. But they are a toss up. As a Skynyrd fan, I'm glad the remastered theirs since most all the originals sound muffled and without any body. But most of their previous unreleased isn't good either. IMO, the only previous unreleased songs are on the Michael Jackson "Bad" album. But there are only 3 songs.