It's ok, but not a huge amount of content,
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This review is from: Bulletproof Ajax (Voices That Matter) (Paperback)
On the plus side, in the remaining pages there are quite a few useful snippets of information and quite a few useful references worth following up. I would have liked stronger conclusions regarding data format choice and best practices for accessibility, but on accessibility at least it may still be impossible to provide a perfect or near perfect solution. I’ll take away from reading this book a few things to look for when code reviewing other peoples’ code, and a few things to take into account when developing my own, but not a huge number of either. I do like Jeremy Keith’s emphasis on Progressive Enhancement, but I think the DOM Scripting book covers it better.
So, it’s ok, but comes nowhere close to Jeremy Keith’s DOM Scripting book. Is “Bulletproof Ajax” worth the RRP? Well, yes it is, if you compare the cost of the book and the time to read it against the cost of time spent re-working systems that initially get Ajax wrong, or fail to use Progressive Enhancement. However, if you look at some other books around the same price and how much useful content they have, you might conclude that it's not great value, even if only relative to some other books.