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To add to the above post, I tried an original Caldigit Expresscard in my 1st gen 15" unibody MBP. It installs and works fine, except they also limit full USB 3.0 operation to their own external drives only. Any other flavour of USB 3.0 drive only runs as USB 2.0. That said it did work well. Also, tried a Shintaro USB 3.0 Expresscard with the Caldigit driver loaded. Caused an instant kernel panic when inserted or on boot. At least someone can get USB 3.0 on OS X going, just is a limited and pricey option.