I bought this while running OS 10.6.8 and ran Rev 0001 firmware. I had no problems at all but eventually upgraded to Rev 0002. Soon after Rev 0009 came out which I then upgraded to as well and have been using for about 5 months so that's what the majority of my review is based on. There was a large speed difference when running benchmark software between Rev 0009 and previous firmware but real world difference could be another thing. To upgrade firmware just download from the Crucial website, burn to CD, and boot from the CD. It's all very very simple.
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