it was good, I don't like the character of Liir too much, but what they did with the character's from the first book was excellent. I was very pleased. I actually like the darker tone the book had over the play in that it makes Elphaba a much more complex character knowing a little more about her past and the struggles she has to get through. And of course the ramifications and self strugles of what it means to be (or not) the "son of a witch" plus it had a superb ending.
Go read it NOW!