I've had two 4K displays. One was a 15" laptop screen. It gave me no end of trouble. Anything that didn't scale properly would be unusably small due to the dow

I've had two 4K displays. One was a 15" laptop screen. It gave me no end of trouble. Anything that didn't scale properly would be unusably small due to the downright excessive pixel density, and a distressing number of apps didn't scale properly. Most everything else about that computer was great, but I ended up replacing it within a few months, mostly due to dissatisfaction with the display. The other is a large external monitor. I can't remember how big - maybe 27"? I like it quite a bit. Combined with a tiling window manager, it's a bit like having a multi-monitor setup, only with even more flexibility in how to arrange your workspace. So, I guess, my advice would be to ignore the marketing terminology and just make sure that your monitor has an appropriate pixel density - not too little, not too much.