I just bought a new 27" retina imac with the 7200 RPM drive only, and am a bit underwhelmed. I already get the sense that it's slower that the seven year old PC it's replacing - that one has a cheap SATA SSD drive I installed a couple years ago. I certainly wasn't expecting this and am worried about the imac's ability to keep up in future. Anyway - While my return period is still open, I've been looking at what to do. 1 - taking the imac apart to the extent needed to put in a blade SSD is beyond what I want to risk, so I think that eliminates that future upgrade option for me. That would be the best option - especially in a year or two when those blase SSD's are bigger and cheaper. But I'm chicken... 2 - I could put in a nice big SATA SSD to replace the 1 TB spinner in there now. After reading ifixit, I'm sure I could do that... But I'm annoyed that the current SATA SSD are so much slower than the hard-to-get-to Blade. 3 - And here's the question - if a wait a year or two, will future easily-replaceable SATA SSD be as fast as the blades of today? If they could be (& not limited by their sata interface) that'd a nice option to look forward to, and would make me more comfortable to keep this imac knowing I could speed it up in future... thanks in advance for you kind advice!