Let me first say that I have been using OGRE for something like 6 years (off and on) and I bought this mostly as a refresher. I knew going in that this book was for beginners, so I didn't expect too many advanced topics. For a total new-comer to OGRE, this is actually a great introductory text. It covers the basic stuff you would want to know and gives you the code to do that. So things like loading a model, creating lights, manipulating objects, and things like that. The author is successful in that regard.
However, if you have been using OGRE already you have probably covered all this same material in the free tutorials online or by reading the documentation.
That said, I still liked the way the material was presented, and it made a somewhat complex topic (3D rendering) approachable for a beginner. Also, don't be worried about the "1.7" version on the cover. The latest 1.8 version of OGRE has mostly the same API so all the concepts and code are still are still pretty much valid.
Also, I got the Kindle edition of this book. The formatting was OK (at least on an actual Kindle device) but suffered a little bit on my Android phone. Since the phone screen is small the code samples would wrap to multiple lines (what should be just on one line) and this made it somewhat difficult to read. But this happens with basically all programming eBooks, so no surprise there. It did look OK on the Kindle 3 and looks great on the Kindle Fire HD. And, for the price, it was a decent value.
