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Well worth it.
Because in the end, what matters most to me is if I can USE the book on an ongoing basis. I'm not going to be able to, because the index for this book is WAY too sparse. It's missing many, many topics. For example, something as simple as the click() and clone() functions aren't in there, and neither is noConflict (which allows JQuery to play nicely with other libraries. And that's just the "C's".
I'm not asking for a complete reference - I understand that Packt does have a JQuery reference. But it would be nice to be able to find things I just read about 15 minutes ago! The poor index means I'm going to end up barely using this book at all.