While this book provides good information on many basic concepts in C++, many of the author's snappy one-line answers are downright annoying. For example:
Q: What is a downcast?
A: Trouble.
Or this:
Q: Why is downcast dangerous?
A: It's like walking on a highwire without a safety net.
Or this:
Q: What is contravariance?
A: The glue that holds OO together.
Many people will find the one-liners amusing, I am sure. Personally I think they are a waste of paper. Good practice should always be making definitive statements in the one-liner, and put the descriptive ones in the paragraph that follows, not the other way round.
To sum up: good technical advice, dubious style.