Dylan played the character Alias in Pat Garrett and Billy the Kid, and an odd fictionalized movie biography called "I'm Not There" played on the concept of Dylan's shape-shifting by having widely disparate actors play parts of his character. So the concept of Dylan as a shifting set of aliases is hardly new, and this coffee-table effort doesn't go deep enough to forge any new connections.
It does include some really nice pictures, but is hampered by its publication too close to the music of the post-gospel period to give it the mature consideration some of it deserves (some of it frankly, still isn't very strong, and hampered by bad production choices). Of course, it is impossible to fault a book for being published when it was, except that after Blood on the Tracks the book focuses basically on quick reviews of the music and loses focus on the man behind the aliases.
So unless you are a deep fan of Dylan searching to pad your bookshelf and can pick it up cheap, this probably merits a pass.