I was hoping people with a dual 4k or 5k monitor setup with a 13 or 15" rMBP can chime in and tell me if you’ve had any glitches or problems with the setup? I am trying to decide whether to go with a 15" rMBP and run 2 4k monitor (probably the Dell P2715Q or P2415Q). I want to be sure that the 15 rMBP can handle the 2 4k/5k displays… I am hoping to run them at 1440 HiDPi (if they are 5k, I’d want to run a bit higher, is 1880 HiDPi a recommended scaled resolution?). At 60 Hz (I'm not interested in running my displays at least than this). For reference, I have 15-30 windows open at any one time, between Chrome windows (with dozens of tabs per window), my IDE, Sublime Text, PDFs, iTerm windows and Sublime Text docs. I’ll sometimes watch youtube or something on vlc but most of the time, my screen has dozens of static windows open. When responding, can you tell me which version rMBP you have and does it have an upgraded dedicated GPU? Do you think I will have any hiccups or glitches or can the rMBP actually handle this workload while displaying 2 HiDPi scaled resolution monitors? Otherwise, I’ll have to go with the 5k iMac and one 5k display.