From Goodreads.com

For thousands of years, the Book of Psalms has been one of God's people's richest resources for expression of worship and development of the spiritual life. At the same time it is one of the more complex and challenging sections of the Bible for expositors. Pastors, teachers, and all serious students of the Bible will find this commentary invaluable for developing their understanding of the Psalms and for improving their ability to expound it with precision and depth.
For each psalm, Dr. Allen Ross guides the reader through a detailed exegetical outline, proposes a homiletical outline, and offers a summary expository idea of the message of the whole psalm.
The commentary includes discussion throughout of three primary challenges to understanding the Psalms: Textual issues: Every major textual difficulty is addressed in order to help the expositor understand the interpretive issues and make decisions when there are multiple available readings.Poetic language: The Psalms are full of poetic imagery, devices and structures. Ross discusses this "language" of Hebrew poetry in its context with each psalm, specifying the precise devices being used and how they work in the psalm.The Psalms' Hebrew grammar and syntax pose a challenge to many expositors, whether they are familiar with Hebrew or not. This commentary illuminates Hebrew constructions word meanings in a way that is helpful both to readers who are comfortable with Hebrew and those who are not.

My Take:  I am always looking for tools to help me to understand the Bible better when I am reading it so I was excited when I was offered this book for review.  This is a very comprehensive book that digs deep into the first 41 Psalms.  The author presents both Greek and Hebrew words and gives you the different meanings so you can have a better grasp of the meaning of the words.  I like the way the other has taken the way of exposition as that is my favorite way of studying the Bible. don't let the size of this volume put you off.  It is very much worth the reading if you gain just a bit of better understanding of the Psalms.  Highly recommended for anyone wanting to understand the Psalms. 
I received a review copy for my honest review.