Worked perfectly out-of-the-box on Linux. Be sure to enable your appropriate firewire and USB kernel options (and recompile). The only drawbacks are in the case design. You have to take out a couple of screws to open it, and then you have to add a few to the hard drive. The rubber "feet" on the top and bottom of the outside of the enclosure kind-of slide around and are prone to coming off, but they seem mostly aesthetic anyway. I am able to achieve a rate of transfer on the old 20GB drive I'm using that's equal to what it would normally be, connected to an IDE port. Output of "hdparm -Tt /dev/sda" (using firewire 400) is below:

/dev/sda:
Timing cached reads: 2420 MB in 2.00 seconds = 1210.13 MB/sec
Timing buffered disk reads: 72 MB in 3.04 seconds = 23.68 MB/sec