I've had the book for a bit now and I can say my love of binding is in-tact. I miss some of the old spirits (the Crow, *sigh*) and those that made the cut aren't quite as powerful as I remember, but since the spirits are adding to the power of existing classes the balance is there...if that sort of thing is important to you... :)
I'm definitely looking forward to the next volume with archetypes for the other classes, spirits to balance out the constellation choices and more feats (hopefully one that encourages multi-classing like Practiced Binder or something).