This is one of the best evangelical commentaries on the Gospel of John. Morris writes clearly, argues carefully, and interacts fairly with other commentators. In the first edition (which I read), he brings in highlights from and evaluates the work of many Biblical scholars from the first half of the 20th century. But he also draws from Augustine and Chrysostom, giving this commentary excellent depth. Morris does not jump to conclusions but weighs the evidence for various textual-critical positions and identifies what is the most appropriate interpretation, based on that evidence (linguistic, historical, headcount of commentators agreeing or disagreeing, etc.). He starts the commentary with insightful yet concise essays on issues regarding the Gospel of John in general (background, historicity, theology, textual oddities such as dislocation of stories, etc.); and he peppers the commentary with more essays to expand the discussion of the Logos, "the world" in John, miracles, the Paraclete, and more. This book is thick for a reason (or several, as I have noted).