Rating: 

It has by far the most lucid description of the the Objective-C language. The chapter in which the student writes, compiles and runs a simple application with only TextEdit and Terminal is brilliant. I particularly like the structure of the book, where the reader can build simple applications quickly, and then add layers of complexity over several chapters. I find it a very effective way of teaching.

The style of writing is a pleasure to read, and the density of information is perfect for me. The exercises are very useful as well.

Thanks so much for an outstanding beginner's book to Cocoa programming!