I am using a late 2015 5k iMac, as this was the only alternative back then. And if needed, I probably would get another high end non-Pro iMac. I would be much more excited about the iMac, if Apple had not glued the machine and I could access and exchange the HD in it. Also a big problem with all iMacs is, you are stuck with the graphics card you bought it with - and there was not really much choice back then.
Yeah, I'd like to see the iMac -- and the Mac mini, for that matter -- move back to at least somewhat more user-upgradeable. I'm willing to mostly forgive the Everything Glued Down aspect of the laptops (although even there they take that unnecessarily far), but there's not much reason both the RAM and the HD/SSD couldn't be more readily swappable on all the models, at the least. It'd be nice to have the GPU on a daughter card, too, even if it's something weirdly proprietary.
