As was stated before, not all Thunderbolt enclosures are equal, and almost never take full advantage of the bus. Reviews show the above enclosure will write slower than USB 3, but read faster. The dock is also much larger than a typical USB 3 enclosure and requires a power supply. USB 3 doesn't if kept under 1TB, from what I have read. If these are trade-offs you are will to take, got for it. I haven't found any reason to think I made the wrong decision to boot from USB 3 instead of Thunderbolt. I still think USB 3 is a better choice, all things considered - less expensive, typically faster, and typically a much smaller footprint.