For the past few months my computer has been suffering from some serious speed issues that I tracked to the 1TB drive that came in my Mid-2011 iMac. And since I am not one for patience and didn't want to wait for the new iMac I went out and purchased a few items. I bought a 256GB Samsung 830 and a LaCie 2Big Thunderbolt Enclosure 4TB (2x2TB). I have my system files, application, Aperture library, etc on the SSD and then my videos, music, and Win7 Virtual Machine on the 2Big drives in RAID-0. The performance of the SSD is awesome but that's pretty well known around the forums. What really surprised me was the performance of the Thunderbolt+RAID-0 combo. I am reading @ ~350MB/s and writing at ~375MB/s which seems pretty good to me. My old drive (which I think was damaged) was reading/writing around 100MB/s. Just wanted to share with some other iMac fans. This thing has a whole new life.