I've heard of some good results with these. I need to figure out who makes their bridge chips. I did see this on their web page, it means they don't use the dreaded Oxford chipset:
We are aware of reports that using the newest release of Mac OS X, "Panther," can result in data loss when used with certain types of external FireWire hard drives, notably those built with certain type of chips.
None of SmartDisk's FireWire hard drives use these types of chips. Therefore your SmartDisk FireWire hard drive should not be affected by the problems reported with Panther. No hard drive firmware update is needed (or is available) for SmartDisk's hard drives.