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I mainly bought it for the auto-pivot feature, which can only be used if the Viewsonic software is installed, opened/activated and the setting is turned on. The Screen-split feature automatically works for my primary 55" 4K monitor and not for the intended secondary Viewsonic monitor. Not only is the feature useless for the Viewsonic it doesn't work correctly on my primary 55" 4k monitor anyway. On another note, I don't own any color calibration device so I can't really speak on that. Bottom line, it's simply a regular 27" 4K monitor with auto-pivot.
I needed a large monitor to attach to my laptop. The external monitor I had was only half the resolution of the laptop resolution. I was stunned by the colors of this monitor. Only drawbacks for this monitor is no built-in camera (something needed during the pandemic shelter-at-home time and having online meetings), and, it does not have built-in speakersm so can attach this monitor to a DVD player. If you can live without the camera and speakers, then this monitor is a great buy!
Picture quality etc. are all very good and adequate for the price. My only issue with it is the User interface and the localization of the buttons. They are at the backside, while their function is indicated on the screen. So its tough to really intuitively find the correct button. Why they were not on the side is beyond me, probably to preserve the thin bezel but this is suboptimal. Otherwise great device.