I don't want to be that guy, specially it's open source. But I would not buy a book from Packt Publishing because of this[1]
[1]<a href="https://plus.google.com/+PaulIrish/posts/XzFaHHPNSfe" rel="nofollow">https://plus.google.com/+PaulIrish/posts/XzFaHHPNSfe</a>
In the interest of full disclosure; before I begin, I would like to make it known that I am an employee of Packt Publishing.
However, with regard msoad's comment, I would like to make it known that this was a mistake. We do give a royalty to Open Source projects that we publish on, as well as to our authors.
You can find full details on this project on our website here: <a href="http://www.packtpub.com/open-source" rel="nofollow">http://www.packtpub.com/open-source</a>
Also, whilst we may provide copies of books for reviewing, we never create or fake any reviews, views are the reviewers own.
We would like to apologize for any confusion or concern any of this may have caused.
Currently I am reading this book in Safari Books Online and it looks excellent. I was not a fan of PacktPub but Lately they are releasing excellent books like Mastering Web development with AngularJS and Learning IPython for interactive computing besides this Machine Learning book. The only grunge against this book is it used Iris database for its "Hello World" and some how i could not wrap around that data, rest seems to be approachable to me (Disclaimer: I have not completed the book).