I recently bought and returned a late-2012 iMac due to several problems that could not be resolved. After much deliberation, I have decided to try again as I liked the machine itself very much. The original iMac was fitted with a 3TB Fusion drive and I was impressed with that in terms of it's general speed when doing tasks. However, I did think that the general responsiveness of the machine was actually slightly worse than my old 2008 iMac that I had running from a 128GB Samsung SSD after the original SSD failed. Now that the 256/512 SSD options are available, is there any advantage in looking at these over the Fusion drive? A lot of the comments on here seem to suggest that the Fusion is 'as fast', 'almost as fast' or 'much slower than 100% SSD. Would SSD make the machine 'snappier' than Fusion and would there be any other real differences?