I bought this after reading a quite positive review in the San Francisco Chronicle's Books section, since I have an ongoing interest in the English language. (It's not my mother tongue, but I feel I've mastered it quite well after living in the US for 17 years.) Sadly, while it was often amusing, the work did not live up to my expectations.
It's perhaps best described as 100 short "columns" about random aspects of etymology and word formation. Each column takes specific word as a starting point, but usually that word is just a conversation starter. Sadly, many of the conversations don't go very deep. The least interesting ones degenerate in long lists of words that "also" follow a specific pattern. The best ones taught me interesting things I didn't know before, but there just weren't enough of these. Some of the worst ones seemed to just be improvisations, discussing some of the author's opinions on non-language-related subjects or telling almost-funny jokes.
The author is also quite keen on the new words brought to us by the age of the Internet. Sadly, he appears to be a rather casual Internet user and doesn't have much to add. Often when he tries to show off his knowledge of Internet jargon he misses the mark by emphasizing terms already obsolete or getting them slightly wrong. I suspect he's using some secondary sources.
All in all, not a total waste, but hardly the best $11 I've ever spent.