I like using this commentary series, and own several as important pieces to my sermon preparation. Of the ones I am familiar with, this one proved to be the most exciting and the most useful. It is difficult to maintain one's diligence and attention during a verse-by-verse study of a book as long as Jeremiah, but Ryken does an admirable job.
The stated purpose of this series is "unqualified commitment to biblical authority, clear exposition of Scripture, readability, and practical application." Having worked through the entire series of sermons on Jeremiah and most the sermon on Lamentations I can say this book delivered on every count. I especially appreciated the evidence of serious exegetical and theological work having been done in the background, and Ryken's ability to make Jeremiah applicable.
I call this commentary exciting because it surprised me just how much there was to be mined out of this Old Testament prophet. I entered my own study of Jeremiah with the determination to work through every chapter and every verse, but with the aid of Ryken's commentary, I discovered riches there I did not expect.
I would whole-heartedly recommend this commentary to anyone preaching over Jeremiah or even serious about their own personally study of the book.