just my 2 cents:
I have been a video professional since 1989, non-linear (AVID then FCP) since 1997.
I’ve worked at post houses, ABC broadcast affiliates, and several corporate and/or satellite networks.
Although I understand the theory of 2 separate FW buses, I have very little trouble with just one.
At work I rock the dual processor tower filled with RAM, however I also have a G5 imac at home that does the same exact thing, just A LOT slower!!!!
I am knocking on wood, since I know it shouldn’t be that way, but it is.