ZOWIE built this panel for esports and the design shows in the details rather than the spec sheet. The S Switch arc sits under the screen and puts brightness, Black eQualizer and crosshair options on physical dials, so settings can be changed mid-round without opening an OSD. Black eQualizer brightens specific parts of the image to make an opponent visible in a dark scene, which is the feature the brand is actually known for. At 144Hz with a TN panel, input lag is the lowest of anything here — and it supports NVIDIA 3D Vision over DVI.
The display for competitive shooters, where response time matters more than pixels. 1080p is the wrong resolution for reading text, which is why it is not the main screen.
TN means genuinely poor viewing angles and washed-out colour compared with the IPS panel here — colour shifts as soon as you move off-centre, which is uncomfortable for desktop work. 1920×1080 at 27 inches is coarse for text. This is the non-K revision at 144Hz: it has no DyAc motion blur reduction, and unlike the XL2731K it has no S Switch arc — the on-screen menu is the only way to change settings.