The Gnome Shell theme is completely reworked and looks beautiful. Though I liked the old design more, the new elements go perfectly well along with the GTK3 theme (May be tiheum should release the old theme under another name?).
The GTK3 theme is quite beautiful and reminds me much of the elementary GTK theme. I think tiheum and danrabbit should collaborate to create a better looking elemenatry theme. IMHO they both are the best designers of all the time!
However, the GTK3 theme has quite a few bugs. For example the rubberband (the selection area when you select multiple elements by dragging your cursor) should have been transparent. For some weird reason, the background color of the view area changes to a blue color in nautilus when I open multiple tabs.
The GTK2 theme could have been better. Yeah, it cannot match the customization power GTK3 gives, but though not such a big deal, many elements don’t match. To be specific, the progressbar, button radius and some gradients. But since it is still a work on progress, I expect it to improve over time. I just wanted to point out the issues I found so that they could be fixed.
Overall, it is quite a great theme and I know you are excited to grab it :)