Im trying to decide between these two for backing up my MacPro. Both are right around $400.00, both use 2 500 mb HDs configured as RAID 0. Though they look different both have the aluminum cheese greater look and will look good next to the MP. Both have 2 FW 800 / 1 FW400 / and 1 USB ports. The Iomega got a nice write up in MacLife, but I know from experience that OWC stuff is typically pretty high quality. The only differences I can see are that the Iomega only has a 1 year warranty compared to the 2 year warranty from OWC. The Iomega comes with EMC retrospect Express while the OWC comes with ProSoft Data Backup. The OWC may have better HDs as it lists the cache at 32MB total, while the Iomega lists cache at 8Mb, though Im not sure that this really matters when running back ups at night. Im leaning towards the OWC based on the longer warranty and the software choice. Id be interested in hearing about experiences with either solution.