Rating: 

This is a very good O'Reilly Nutshell book.
If you are familiar with O'Reilly Nutshell books like "Unix in a Nutshell" and "Perl in a Nutshell",
that may be all you need to hear.

But perhaps you are not familiar with O'Reilly Nutshell books.
They are concise comprehensive practical references
on some technical topic.
They are, however, not tutorials.
O'Reilly has been publishing this series for a lot of years
and the Nutshell books are generally really good.
IMO this one sure is.

If you want more detail, you could take a look at my somewhat longer review.