As you didn't list it, I can't comment further.
I can import video into the computer via firewire with my sony camcorder dcr-hc85. I can also export from my computer to my camcorder using the audio-visual jack. The issue I have with this is the video quality is somewhat compromised. In the sony manual...p.93...it shows another alternative to exporting to the camcorder using an i-link or firewire. It doesn't appear to work. What am I doing wrong?