Is a FireWire RAID overkill for DV editing? I don't think so. But then it seems that all FireWire RAIDs are driven by software, not hardware based. In which case, the only advantage of the Granite solution is the swappable drive bays. Otherwise, you can make or buy any number of drives and configure a software RAID for them.
I guess I was looking for feedback from people who have had positive and negative experiences with different external drives or with matching specific drives to specific enclosures.
Maybe there's just so much parity among HD manufacturers now that my question is "overkill" as you say. I'm just checking with my friendly Mac AV people to see if they can help me avoid pitfalls or grab superior solutions.
Meanwhile, I've left messages at Granite and hope to hear from them. I think the SMART tech is a bit too pricey for me, but I like their swappable drive mechanisms. I'm leaning towards putting four 80 GB Seagate Barracudas ATAT IV 7200rpm (at $110 a piece) into a $799 4 bay Granite enclosure. Just need to verify that they support this drive and that the RAID software is compatible with the latest version of OSX.