Went from 3x 1920x1080 monitors to a 43" 4k IPS display a little over a year ago and has been great once used to it. Tiling 6 apps using divvy works nicely.
Lately I have found myself wishing there was a wider format 5760 x 2160 screen of about 37-43" for 6 full HD screens-worth. But can't have everything I guess.