I must say, in the interests of full disclosure, that I know the author personally. He eats, breathes, sleeps, etc., SQL Server. He knows what he is talking about. He is a Microsoft MVP and is a terrific resource for any information regarding SQL Server in general, not just for Integration Services.
I would pick up this book. I got my copy long ago, when they were handing it out for free, and I use it all of the time. If my copy were an actual book, it would be pretty dog-eared by now, but it's an eBook.
For the price, this book is a must-have. I still might order this, because sometimes it's good to have a real book when you don't have access to all of your stuff electronically.