From what I have heard about this book there is nothing there that inspires me. There are too many other books sitting in my collection that havent been read properly yet and in a months time there will be 3 more.
In my uninformed opinion, this is a supplement that you will either love or not care for. Its narrow focus means it is the sort of product that would more suit a small d20 publisher rather than wotc. Despite the reputation of its authors, wotc were not sure what to do with it. However it probably is quality material and the didnt want to discard it, so it sat waiting for a gap in they release schedule. With 3.5 iminent and efforts concentrating on that, wotc have decided to plug the gap and clear the shelves by releasing it now. This could also be because of compatibility issues with it and 3.5 - this was written a while ago.
I'll admit that this is a fairly big opinion for something that I have never layed my hands on. I would hope that someone more informed could enlighten us all. I will pick it up in a book shop and look through it, I will read through the reviews, and maybe I will purchase it.