Firewire Recording From Videotron Works
I just got a SA8300HD from Videotron today, and after some fighting, I've managed to record to my Mac via Firewire, using AVCVideoCap (part of the Firewire SDK).
Everything in the SA8300's info screen seems to indicate Firewire is disabled -- any 1394 status is "Unavailable". But it showed up as a device on my Mac when connected, and while I cannot get it to record live TV, playing back a recorded show and starting a capture works! I've successfully recorded PBSHD and it looks great!