In the first 100 pages, it tell me all the hardware of ios device and how to use the seniors. And it gives simple example. Which is very very good, save me a lot of time in finding the material.

In the next 200 pages. it combine "cocos2D, Third-party toolkit, openGL, facebook API, openCV" . Which is not helpful.

If I know don't know these, I cannot figure it out but simply run the code. If I know these, why should I read this book ?

PS: the example code is easy to crash, like student demo program.

I'm about 3/4 of the way through the book and am finding it very useful; the chapters are well written and easy to follow. I especially liked the chapters on Sensors and Building a marker-based AR application and am looking forward to working through the facial recognition chapters.

So far, most people in marketing are thinking about augmented reality as it pertains to TV advertising and, to some extent, show production. This book opens up an entire new world for AR applications for iPad and iPhone. This is really nothing less than a handbook that any developer can use to create a niche service in advanced mobile app development. Highly recommended.