the differences in latency between the two units might be a bit larger I think
see rme's page
http://www.rme-audio.com/english/tec...s_tests_01.htm
when possible I like to monitor through the software and I personally wonder if firewire just isn't fast enough -- but I have not tried the fireface so I don't know. I asked this question the other day but nobody responded. I wish somebody who has used both could answer this: can a fw unit perform as well as pci in terms of latency?