Upon realization of the level of simplicity in the process, I opted to unfuse my 2tb fusion drive with the late 2015 iMac 5K. This seems to be a somewhat controversial move, in that many seem to be against it, and many users have been unhappy with the split. To me, though, it always sounded like the better option. As soon as I spent some time with Fusion drive, I noted various imperfections with it or certain aspects that I had an aversion to. Another point to add, is that I actually enjoy the management of files, on a somewhat casual level. It is something I do for somewhat of a hobby anyway, or have over the years. It more or less equates to the digital version of housekeeping, the organizational angle to it is something that I am not altogether opposed to. Add in the fact that I always (in my usage scenario) will want certain things on the SSD and certain things on the HDD. For example, media such as music and TV shows. I never want those on the SSD. Terrible idea. I recently did a mass import of several seasons of shows and it seemed that some shows remained sitting on the SSD. Ok, well that's not good. That's a complete waste of space. For any of my itunes files those won't ever need to be on the SSD. The reality is the only data I will ever want on the SSD are system files, the OS itself, and applications. Management on that level is possible with a split, and impossible without. Now my massive library of data can be stored on an internal HDD (don't have to rely on an external) and I have the equivalent read speed of a 256 SSD. Another point to add is that with the split, I can manage how much data is on the SSD. If an SSD regularly only has 4GB available, its performance will suffer from being so bogged down. My SSD has over half its space left after all my system files and applications have gone onto it, and I plan to keep it at about that level to maintain the speed. Having that much free space on the SSD is not possible without an unfuse. I believe unfusing the drive allows you a level of control that is not possible without doing so, and believe it to be undoubtedly superior to a fusion drive.