I'm just setting up this Promise Pegasus 4-drive array to my MacBook Air. It connected up immediately. The nice thing is, I can connect my non-Thunderbolt external display to the back of the Promise drive using a standard mini-display port adaptor (which fits in the Thunderbolt connector). That's nice to know, since the TB cables are $50 each. The drive is quiet, and immediately started the process of synchronizing the four drives in the array. It's supposed to take about 10 hours. After that, I'll transfer my Lightroom files over via 'snail transfer' (usb 2.0) and we'll see just how fast this thing runs.