Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Descriptive

Here is a book that is descriptive, comprehensive and in-depth about Apple's newest, UNIX-based operating system. The size of the book may be daunting, but the content is satisfying and explains virtually everything OS X in-depth. Flip to any page, and you will find well-described and illustrative coverage on something related to OS X. Virtually everything that pertains to OS X is clearly explained in-depth. The book doesn't go far beyond the scope of explaning the new OS and - indeed - letting you master it.It also functions well as an effective troubleshooter. This book's on my shelf next to my Macs all the time. Highly recommended.