I rather dislike pretty much all of it, but I'll wait and see if it grows on me.
In particular the GTK Themes seem really ugly. I don't like Dark themes at all, and the light one looks too much like Plastik from KDE.
Personally I'm a big fan of the old "Human Clearlooks" theme, which I'll probably be sticking to for some time - but I'll definitely give the new one a go and see if it grows on me.