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Aparently it works: http://forum.linuxmce.org/index.php?topic=2922.0
If connecting via firewire, you should be able to configure this device via mythtv-setup. Myth supports firewire recording and channel changing directly via firewire. Content varies by provider and many providers (Charter) have encrypted content over firewire, which LMCE and Myth cannot record.
MythTV wiki reference: http://www.mythtv.org/wiki/index.php/FireWire
MythTV wiki experience: http://www.mythtv.org/wiki/Firewire_Cable_Box_Compatibility