This external drive works straight from the box on Macintosh. It runs quietly, looks beautiful, and has a tiny footprint. I use it to store all my AIFF music files which are retrieved seamlessly via FireWire 800.
Why only three stars? Well, it isn't always recognized on start/re-start. I'm not sure why as this phenomenon doesn't seem to correlate with any other action, but without an on/off switch it has to be unplugged and replugged from the rear to initiate it which is a fiddle and detracts from its otherwise excellent performance. Additionally, capacity is actually nearer 1.3 TB. Mine also died after eight months usage! Fortunately, I had just obtained a TimeCapsule the week before and backed up the >500GB of music files I had painstakingly digitized from my CD collection. I now await a replacement (there's a 5 year Seagate warranty) so I can restore (hopefully!) and access my music library again.