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Pro Immersive curved display
Typically, wide monitors have some distortion near the edges whether it be colour distortion, or field-of-view distortion (because the edges are further away, images near the edges will appear smaller than if they were dead-centre). Because of the curve, this effect is negated.
In addition to measurable benefits, there's also the cool-factor to take into consideration. Curved displays are just plain neat, and really help to immerse you into whatever it is you're doing.