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).