Currently running on one of my Dell 24" monitors. Gave my T.V. to my son. Going to hold out and pick up a new 4k monitor for my PC soon and might pick up a 1080p 27" unit to supplement. Then I will run my One on that.
I used to use a 73" Samsung as well as a 43" Sharp Aquous but really prefer the smaller screen for 1080p. Nothing over 27" for me.