Disclosure: I think of this book in the context of Paul House's Old Testament Theology class, which I had consecutively while reading this book. I think his class gets 6 out of 5 stars and his book probably gets 4/5 so he gets 5/5.
House presents a very compelling way to do Old Testament Theology which has a significant on the way Christians view the Old and New Testament. Utilizing the canonical method, House shows the unity of OT, stressing monotheism, covenant, and eventually, Messiah.
House's lengthy chapter at the beginning of the book on the History of Old Testament Theology is quite boring but also quite important to understand the context in which his OTT was written and also to understand how his OTT contributes to the overall discipline of OTT.
The books is accessible and a helpful resource. Having already read the whole book (most of it), I can now refer back to specific books to see how they fit into and contribute to the OT canon. This book is a little old (published in 1998 and only covers scholarship through 1993), but it is still incredibly helpful.
I would encourage anyone to go to wherever Paul House is whether he's teaching at Beeson Divinity School, Briarwood Presbyterian Church, any conferences he speaks at in order to learn his method of Old Testament Theology.