Dr. Edward Young has produced a comprehensive, verse-by-verse, three volume commentary on the Old Testament Book of Isaiah. He states that the purpose of his work is to let Isaiah speak for himself, and to "endeavor to understand what he says." His target audience is the minister and Sunday School teacher, so linguistic and technical discussions are often relegated to footnotes. At the same time, his scholarship is sound, and he cites a rich variety of resources, both ancient and modern. The translation of Isaiah which he uses in this commentary is his own. His theological stance is conservative, and the commentary presents Isaiah as the work of a single author. While he argues in favor of this view, he acknowledges that many modern scholars disagree, and he devotes Appendix II of volume 2 to a discussion of their viewpoints. In my own role as a an Adult Sunday School Class teacher, I find his exposition to be useful and relevant, without going too far over my head. I wish there were more commentaries like this.
This is a great verse by verse comprehensive insight into the book of Isaiah. Out of a few different commentaries that I've looked into for my study on Isaiah this will be my preferred choice. It's very readable and enjoyable for any student or Bible teacher as well.