It's a very good book, and it covers a very rare topic (I actually don't know of any other similar book--you'd have to hit database-specific sources to get this kind of info.) I haven't touched the code in it, though, so it's possible there are errors, but the conceptual and algorithmic wealth that's contained in the book makes it worth the price (twice over, actually.) So, the reviews are probably correct, but unduly harsh in their criticism, and unfair in stressing some relatively unimportant weaknesses (potentially--I haven't used the code) over the huge overall usefulness of this work. What sucks about it is that bookpool.com doesn't carry it, and therefore you'll have to pay pretty much the sticker price <g>. Still it's worth, I think.