I have the 2014 iMac 5k. It's almost exactly one year old. In general I'm very happy with it, but one of the main regrets I have is that I got the 512 GB SSD instead of the 1 TB. I'm considering selling my current machine and buying the 2015 model with 1 TB SSD. I'd probably max the RAM to 64 GB because I do a fair amount of Photoshop work (photography). I have 32 GB now, though, and that's probably enough for what I do so I'm not sure I'll see much of a difference. The biggest appeals are the bigger internal hard drive (which I can't easily upgrade myself), faster flash storage, higher RAM capacity, and better graphics card—though I don't do any gaming. Just wondering if it's worth the upgrade. Did anyone else go from 2014 to 2015 iMac? If so, why, and are you happy you did?