So I used this to convert an FW800 G4 to work with os9. I need this as a backup system for my remote session music stuff. It works very well with protools 5.1.3 and all the cards and peripherals are working fine. Very happy:). Just something a bit odd, I used two of my external firewire drives ( a glyph GT050 and a Lacie rugged) to transfer session data onto the new machine to check it out. No problem with that but on returning to my original FW400 G4 both drives are running very slow for transferring files, both onto and off, usually in the first 30 seconds, then the speed picks up but still nowhere near as fast as they used to be. I will be formatting the drives again and am confident that will fix but just seems a bit strange. Also, there's something weird going on with USB, it (the fw800 machine) doesn't seem to like more than two devices (in my case a hub for keyboard and mouse and a midi transmitter) being operational at the same time.
I have yet to get round to testing the system thoroughly, there was too much other stuff to do, and at the end of the day it works.
Apart from those things this is a wonderful thing. Thank you!