Tog's previous book (Tog on Interface) is still one of my favourite books on the basics of UI design and how to think about it. To my mind it even holds up well many years after the subjects it discusses are dated.
Despite the titular similarity, this book does not have the same property. Created in the mid 1990s as part of Sun's Starfire UI futures project, it talks a lot about the future (especially 2004). The book gets a lot of stuff right. But as a result, reading it from a 2014 perspective doesn't provide much interest beyond the historical.
Tog is witty, and I wish I'd read this book in 1996, when I would have enjoyed it. But at this point, I wouldn't bother.