Tried it on Nvidia 6200, initially all looked well. But something died with the desktop. Also compiz was constantly stealing about 8% of a 2GHZ cpu. So I reverted to 2D. Which was pretty similar - albeit for a few of the transitions. It was missing drag to top - to full screen, but you can double click the window bar instead.
What I was trying to say with the above post. Was you get a little extra gloss with Unity3D, but it's not over the top. And the 2D fallback isn't miles away.
I have noticed that 2D does look uglier in places - like modal popups - that are not at all in keep with the rest of the interface. Which reminds me of the kde shutdown window - which is also fugly.
