I'm giving the two stars only because the design is colored like my mac, and it's about the only thunderbolt hard drive out there right now that is portable.
THIS DRIVES THUNDERBOLT INTERFACE FAILED ME WITHIN THREE WEEKS OF OWNING IT. I AM NOT THE ONLY ONE. The drive randomly ejected itself, and then would not come back up over thunderbolt. USB works, but why buy a thunderbolt drive if you are going to use the USB interface as primary? May as well save yourself 150 bucks if you're going to go that route.
I used this for my time machine backups while on the road. First, unless you want to use thunderbolt because it frees up a USB port, don't waste your money on it. This is a 5200 RPM drive, and you will get the same speeds on USB 3.0. It simply cannot saturate the interface. It is by no means 10 Gb/s. You will get between 85 and 105 MB/s with this drive (less than 1 Gb/s). If you want speed, get the SSD Thunderbolt external. Apple will not allow you to return items after 14 days, I now have to deal with buffalo directly. I am not a happy camper. This drive's labeling is misleading, and it is NOT reliable.