As further proof, I'll post one w/ a render going - average A4 char, some clothes, some AOL/IBL, the usual stuff.

Oh, system specs. Almost forgot:

Software:

• Novell OpenSuSE Linux
• NVIDIA prop. video driver
• wine 0.9.61(rpm downloaded and installed from http://www.winehq.org)
• tweaked it with a couple of settings that made the thing run perfectly after the initial load:

$> cd ~/.wine/drive_c/windows
$> mv system32 system32.bak
$> mv Microsoft.NET Microsoft.NET.bak
$> ln -s /windows/C/WINDOWS/system32 .
$> ln -s /windows/C/WINDOWS/Microsoft.NET .

• ...and that's it.

Hardware:

Intel Pentium 4 Extreme Edition 3.2GHz w/ HT
2GB DDR2 PC 5200 RAM
GeForce 6800 GTS PCIe video card latched onto an NEC 125F monitor.

Loaded A4 next with a basic clothed character (shown here), and went for a full AOL/IBL render (ditto).

Overall performance? There are a couple of small UI quirks (e.g. moving a window in the UI causes the click-n-drag to 'stick', but a second click at the destination lets go). Otherwise, it is quite responsive to movement and dial settings. Removing IK was damned-near instantaneous (unlike before in Windows or OSX, where it usually takes awhile).  Render time was about average (too bad...)