I am surprised this book has not had any reviews yet. So let me remedy that since this is a book that really needs to get into the hands of lovers of this profound Gospel.
The contributors are a tandem of a Biblical NT scholar (Maloney) and a professor of theology (Kelly). Maloney has done much work in Johannine studies, producing a commentary on John in the Sacra Pagina series as well as other writings on the gospel. Kelly has done brilliant work on the trinity (see his influential book: The Trinity of Love: A Theology of the Christian God (New Theology Texts)).
I can't think of a better book to understand the Gospel of John in it's rich theological dimensions. Not bogged down with scholarly, academic minutiae, M&K write with great substance and clarity that will make reading not a chore but a joy. Grab your translation of choice and follow along with the commentary and I think, for many, you'll view the Gospel with fresh eyes.
John's Jesus, for these authors, is the revelation of an absolutely inclusive, loving God who wishes to ingather all into the gracious provision of the Son of life. The authors marvelously deal with the harder passages of conflict within the Gospel and see them as the response of certain Jews that would have nothing to do with this inclusive (and seemingly indiscriminate) divine invitation. God came not to condemn but to heal, transform and usher ALL (think "the whole world") into eternal life. Jesus' opposition were the ones that choose to reject and shut themselves outside the sphere of the divine graciousness, blinded to the blazing light of God's "foolish" extravagant love.
Much commentary writing is quite academic and a chore to digest. Certainly, there is a much needed place for these often learned repositories of important information and expertise. But I find those commentaries that sparkle with penetrating theological imagination into the biblical texts as surely great gifts to the Christian and the church at large.