Johnny Cash: The Redemption of an American Icon

I found it particularly curious that his son seems to have had a complete change of heart, after having written such a scathing biography about his mother in 2007. This film is just a series of C&W stars and others commenting on how Johnny Cash influenced them. It totally eliminates the truth (if his son is accurate) about the last half of Johnny & June's lives together as drug addicts spending money like drunken sailors. I did really enjoy his performance at Folsom Prison and, of course, the haunting "Hurt." But I'd read also that the cave story was made up. Is it true or not? I'd been so moved in Nashville at the Johnny Cash Museum, I wanted this to be a REAL documentary about the REAL man... not a bunch of people sainting him in retrospect.