I also have a 55" Vizio P55-C1 on a standing desk. It's on cheap VESA legs to drop it down to 0.5" off the desk (the included stand puts it about 3" off the sur

I also have a 55" Vizio P55-C1 on a standing desk. It's on cheap VESA legs to drop it down to 0.5" off the desk (the included stand puts it about 3" off the surface). It's on an iMovR thermodesk elite with an 83" by 30" top and has a BenQ BL3201PH on either side in portrait mode. Using 1x scaling in windows looks just right. The only issue with the Vizio P55-c1 is that it won't do true 4:4:4 chroma at 4k, but input lag is great, especially at 120hz when running 1080p for games (I play Overwatch at a fairly high level). 1x scaling factor is the key for reasonable viewing distances with 4K. Consider that it's basically quad (2x2 setup) 1080p monitors, and compare the size of 24" 1080p screens in such a configuration with a single 4K 55".