I upgraded to Alpha 3 earlier. Mind you, I'm using KUbuntu, and KDE is already pretty stable, so I make no guarantees when it comes to Ubuntu... but...
Graphics look great! Performance is good, even KWin's directly accelerated Gaussian blur works like a charm.
GLXgears+wobbly Windows+panel with Gaussian Blur = about half CPU usage. (Yes, this is with modesetting/dri2)
Good. Job. Ubuntu.
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