Rating: 

First, there are too many errors and typos. Just as an example, on page 348: script sourcing is described as execution in one script comment, example 2-6 claims to show a system-wide .bashrc file (with the leading dot), and example 2-7 claims to source the /etc/bashrc, although it does not. Not every page has 3 errors on it, of course, but generally the book does not make an impression of being proofread too carefully.

Second problem is that the author does not seem to have much experience with any other ditribution than RedHat. Almost all examples are RH-specific, and sometimes the description is valid only for the RH system. E.g., the pump command, whois being a link to fwhois, the Xsetup_0 configuration file, or usage of the RH-modified font server ("unix:/-1") in XF86Config. The exams are truly distribution-neutral, the book is not.

The last comment concerns my impression that the author ran out of energy while writing the book. The chapters on 101 exam are much better than those on 102 exam. The last few chapters on networking and security are particularly weak. E.g., the description of non-routable networks (10.* and friends) or the DNS service is not sufficient to answer the test questions. The highlighter's index for 102 exam is also much worse than that for the 101 exam. E.g., the rpm and dpkg summary is only six lines long while these are the most important test topics of the 102 exam (as is also indicated by their high weights).

In summary, I would somewhat reluctantly recommend this book to those taking the LPI test - despite all the problems, it represents a useful and fairly complete overview. However, don't rely on it too much and check the manpages and HOWTOs often.