I have the base Retina MBP model, 2.3/8/256. I made a clone of my hard drive using a Seagate GoFlex Thunderbolt Adapter and a Seagate 500GB, 7200rpm drive. I had to purchase the Apple Thunderbolt cable. It took 20 minutes to move the 80GB and make the clone, using Super Duper. The Thunderbolt Adapter does get warm.