I know the pain to tear down the new iMac makes lots of people go for external SSDs. Instead of sequential r/w speed, my concern is the random speed. Since there is a bridge chip between SATA and Thunderbolt, I highly suspect this will definitely degrade SSD's performance when reading/writing lots of tiny files. Does anybody have a benchmark of that effect? After all, almost no respond time is the biggest edge over spinning HDDs.