Ryrie's Dispensationalism, Revised and Expanded, is well worth the time and money. Anyone who wishes to understand Dispensational Premillennial Theology, Covenant Theology, Progressive Dispensational Theology, and Ultra-Dispensational Theology and how they relate to "rightly dividing the word of truth", needs to purchase this book.
I remember the late J vernon Mcgee say that Dispensationalism was the greatest blessing to him after salvation. Well may I say friends that this book is the greatest blessing to dispensationalism. This is a positive presentation of dispensational theology at its best by an American theologian. It is written in such a clear style such that the novice and the seasoned theologian can both read and profit from it.