Just wanted to share my experience with trying 2 alternatives for an external TB boot drive. First went with the LaCie 3TB drive. Did a fresh install of Mavericks and all my software. Speed was fine, though not much faster than the internal HDD that is beginning to show it's age. I run Adobe LR/PS6 on a regular basis, and wasn't blown away with the performance. Switched to the LaCie 256GB SSD TB drive. Did a clone from the previous 3TB drive, installed Groth's TRIM enabler (couldn't tell you what it does, but it was free and came recommended) and boot times, app start times, performance...All super quick. Seriously, night and day. Going to put it through it's paces and see how stable/reliable it is. I'll update once I've seen it action for a while. UPDATE: See post #4. Now that's it's been nearly a year.