Review on ViewSonic VP3268A 4K Ergonomic DisplayPort Professional Monitor, 3840X2160P Resolution, Cable Lock Slot, Anti-Glare, 3H Surface Hardness, On-Screen Display (OSD), ‎VP3268A-4K, HDMI, HD, 4K by Darrin Sanchez

I have bought this double set from Revain twice. When the monitors first arrived, one was DOA - wouldn't turn on. The second time the monitors worked twice within a week. Unfortunately, one of the monitors developed vertical pixel lines and had to be returned. Image quality (and color reproduction) was good while it lasted, but the monitors have real quality control issues.