Over on Edirol.com, I found the interface being referenced. Looks interesting -- 10 in/10out, with 4 microphone preamps with phantom power, analog line in/out connections, and ADAT lightpipe in/out. I want more info - they don't give enough specs about the preamps, for example.
Speed of USB2 is comparable to firewire (480 for USB2, 400 for firewire) -- you get down into talking about packet efficiency and overhead utilization, etc. The bottom line is that they are both fast. USB2 is cheaper to implement because by definition Firewire devices have to be "smarter" -- able to control the transaction, not just respond.
But the most telling thing is that USB2 is much more common on PCs than firewire. For Macs, I don't even know if there IS a USB2 connector, but for PCs, basically all the new PCS have USB2 instead of the original USB connection.
-lee-