The best commentary on Isaiah, hands down, is Motyer's stand alone volume published by InterVarsity Press. It is semi-technical, so those who are not trained in the biblical languages may find some sections more difficult than others, but the wealth of exegetical insight is worth the effort. For those who would like to gain the benefits of Motyer's work without the technicalities, he has also contributed the volume on Isaiah to the Tyndale series. This smaller volume is not simply a summary of the larger work. Motyer went back to the text, and this smaller volume contains many helpful insights not found in the larger work. [Full Review]

A heavier and more detailed study than his commentary in the TOTC.

This would be my choice for a lean and useful technical commentary. It is in the top three on Isaiah. There is depth of insight and evenness in style here that is not often found in today's market (last 2 decades).

Attention to textual details within the literary structure of the book. Evangelical. [Full Review]

Attention to textual details within the literary structure of the book. Evangelical. [Full Review]