I think it could be a toss up between Sonnet box or the OWC box... Looks to be the same. Back in the days of Firewire and SCSI and Zip Drives i had purchased a Sonnet processor upgrade for a G4. It fried and was not happy at the time. Replaced it with one from OWC and it fried too. But they replaced it really fast and all was well in the world. Guess i still holding a little grudge.