I am a fan of Cash's music. I recommend this show with the caveat that you not have great expectations of it. It's a pleasant way to spend an afternoon if you like Cash songs and the music is performed well. The performers did perform Cash's biggest hits that I wanted to hear, yet although I own several of Cash's CDs, there were many songs I wasn't familiar with, mostly the gospel ones.
The show was rather slow-moving for a while at first. There was little of Johnny's life covered, just a few key moments so there wasn't much dramatic performance between the songs. The woman sitting next to me commented that she had seen the Patsy Cline show too and that one was better because it had more dramatic content. The performers were very talented and my one criticism of them is at times the female performer, Amy, sang too loudly bordering on screeching out the song, but in fairness, not most of the time. It didn't quite make sense that all five performers, including Amy, introduced themselves at the beginning as being Johnny Cash, yet clearly Amy was June Carter at times during the performance.
I enjoyed the show because I like Cash's music and I never heard him in a live performance, so I liked hearing the music live. However, there wasn't anything much more to the show in terms of fleshing out his life. I have to say that I enjoyed the film including the music in Walk the Line better than this show, but I'm still glad I saw it. I'm also glad I received a $10 discount code for being a member of the Rock and Roll Hall of Fame so that I didn't spend full price to see the show..