I have been using this for a couple of days now and while at first it's a slight shock to see everything rearranged, I REALLY love it! That menu bar at the top, so handy! Always stays in place no matter where you are in a thread.
Did a bit of real estate moving for my customization of my Home page and it took me a few tries to get the hang of how to set things in the ideal spot, but it's a great feature!