A while back I got asked if I'd review this book, but as they could only get me a copy in PDF format, it's taken a while to get to it. Whilst I like having electronic copies of books, I generally prefer to read them in paper form, and just have the electronic copy for reference.
But anyway — this book calls itself "A step-by-step guide to getting the most of Microsoft SQL Server Reporting Services 2008". At 536 pages, I remember my first thoughts being that it seemed awfully long for the level that it's aimed at. However, as I went through it, I found that this was largely down to the sheer number of screenshots. This is great, and particularly for an eBook. It means that someone trying to learn about a particular screen can easily click the "Next Page" button until they see that screen.
As for whether or not I'd recommend this book to someone learning Reporting Services — well, it depends on your style of learning.
If you want something deeper, that explains more about the choices you're making, and the paradigms you should be considering, then maybe this book isn't for you.
But if you want to jump into SSRS, looking at example after example, to get a hands-on feel for the product, then this book is great. It feels like labs when you're reading it, and that's going to suit a lot of people.