Been using my new iMac 5k i7 m395 1TB-SSD 16GB-RAM for about a week now and generally it's great. Very fast and of course incredible screen. Speakers sound a little tinny, but that's neither here nor there. I use the machine primarily for photo work. I spend the most time in Lightroom CC editing Sony A7Rii Raw files. As I suspected (thanks to MacRumors threads), it stutters a bit while performing various tasks in LR. Rapid cropping, brush tool, spot removal and a couple of the sliders are the bulk of said tasks. Not ideal, but whatever. Hopefully Adobe can sort that out in an update. I don't expect my machine to handle all these pixels better with age. The fan is what surprises me, though. It ramps up pretty quickly in LR and sometimes without having editing for too long. Am I alone? I suspect not, but I am indeed curious. My old 2010 iMac very rarely ramped up its fan--never in LR that I can recall.