As many reviewers have already noted, this book is a bit of a mixed bag. While the specific technologies and predictions seem a bit dated, Brand's insightful analysis and excellent presentation make this an enjoyable and informative read.
There is one characteristic of this text that doesn't appear to be mentioned by other reviewers, however, and that is its "time capsule" aspect. That is, Brand does a pretty good job of transporting the reader "back" to the mid-late 80s, when the book was written. Not only are the technologies indicators of the time, but the socio-political landscape as well (at least as far as I remember it). I think that, for today's reader, Brand's excellent explorations of the impact of Reaganomics, Japan's usurping of American manufacturing, the globalizing impact of technology, etc. provide tremendous value.
I think that it is a somewhat rare thing for an author to so wholly encapsulate a time such that the later reader can access the notions and movements of an age so effectively. Brand provides such a rare glimpse in this work - a time portal back to the mid-80s, if you will. As a chapter in the history of computing, I think that most will agree that this work is a worthwhile addition. I suspect that most readers will also find this an interesting trip back to an earlier time.