Summary: The brightness at the top of the panel was much darker than the lower part of the panel. Kind of like a gradient from top to bottom. ViewSonic replaced it with another, but it suffered the same problem. I returned both monitors.
Summary: Between the monitor and the tech support I will never buy another ViewSonic. The top of the screen is dark. The bottom is washed out. The color in between is nowhere near accurate. They have no Mac compatible drivers.