Without having yet seen the Vault myself, I can however say that Rinzler's Making of is probably the absolute best product on behind-the-film to ever have been released. I don't care how good The Vault is, get Rinzler's Making of, because that is an absolute necessity IMO, definitley the best behind-the-scenes book I have ever read and I guarantee that you will not regret. The Vault is a sort of typical "bonus material" type stuff but The Making of Star Wars is absolutely definitive.