Having an older Mac, I had to succumb to the slowness of USB 2.0. GoFlex is certainly Flexible, but most of you can get by on the Firewire 800 cable.
Cool right? Optionally, you can also use a USB 3.0 or eSATA cable if you have a machine that supports those. With Thunderbolt announced on the Mac, you’ll soon be able to purchase an adapter for your portable Seagate HDD. At first I hated the idea of having these adapters, but you’ll quickly learn to love their chunkiness. The GoFlex for Mac Ultra-Portable includes SATA adapters for USB 2.0 and Firewire 800 in the box.