I am researching this right now. I had an older FW400 drive with the Oxford bridge board running under Jaguar and after waiting a few updates to Panther, I moved it over to Panther and it caused the drive to mount once and disappear once and be unusable after that, even on the Jaguar system.
I wrote off that enclosure as bad and ordered another on to work on Panther. Now that I am about to go to Tiger I a suspicious that the first enclosure is not really bad, just needs a firmware update.
My concern is that using the new FW400 enclosure with a drive is part of the sequence I will need to use when moving from Panther to Tiger.
My question; is the firmware in this enclosures bridge board usable in Tiger or not? If you read MacFixit and other troubleshooting sites, you will pick up a thread about Firewire400 drives not mounting in Tiger.
I am investigating ways to verify what version of firmware is in each FW400 enclosure and what it needs to be for Tiger.