Some of you may find this tidbit interesting.. I was in an Apple store today and noticed that the 27" iMacs were running particularly slow (top end configuration with 2TB Fusion Drive). Opened Disk Utility and it turns out the fusion drive was un-linked and that the entire system was running off the 2TB HDD, with the 128GB SSD left empty. Thinking that this was crazy / why would a store set up the iMac this way, I asked one of the employees and they told me it was because Deep Freeze, the software used to reset each demo Mac every few days doesn't support fusion drives (second ref). Just thought this sucked and wanted to share -all the iMacs on demo are running on slow hard drives!