The Ajax Bible is like many of the other Bible books. They start out fairly simple but ramp up into more complex concepts fairly quickly. If you are reading the book as a beginner in Ajax, you may have some difficulty understanding some of the concepts in the book, but if you are an experienced web developer, you shouldn’t have many problems with the content. For me, I normally use the Bible book are reference books because they give lots of examples so you can see how functions are used in code.
In conclusion, I find the Ajax Bible a good book. It gives plenty of examples and well thought out explanations on how to use them.