This book is well-written, interesting and fairly well-researched for anyone who likes this sort of thing. With the pace that technology advances at, particularly with regards to computers, this 15 year old book has become entirely historical. Absolutely none of the events or technologies are relevant to the present day except in the context of history.
Nevertheless, if you're looking for background info on hacking, phreaking, viruses and other computer security related matters, it's well worth a read. Most of the information could be found in other books written about the same time as this one, however it's still very readable and does provide a comprehensive, though not particularly detailed, gathering of most of the relevant events over the past 30 years. In that regard it's also a good reference if you want to know how hacking and phreaking started, right from the very beginning.
Also, it's a good introduction for the lay person interested in finding out what hacking and phreaking is, and describes things like basic virus writing, boot sector viruses, executable file-based viruses, basic hacker exploits, the original tone-based phreaking methods, etc... However anyone really interested in this stuff would need to continue on learning through to updated information.
It's an old book now; the terminology is quaint both because it's targeted at the lay person and it almost predates the Internet. But it does form an important part of the limited literature available which covers that time period. Also, although it suggests that the doom and gloom scenario touted at the time with regards to technology destroying us all is over-hyped (as we can see in hindsight) the book still indulges in jumping on the hype bandwagon itself to some degree.