AVS Special Member
Join Date: Jul 2007
Location: Schenectady, New York
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The only big benefit is more light gets reflected back towards the viewer (instead of reflecting on to the walls) and if you're using a curved screen with an anamorphic lens in a 2.35:1 scenario, if the lens is creating a pin cushion effect the curvature of the screen helps reduce any noticeable pincushion because it conforms to the artifact.
There really is no PQ benefit to using a curved screen. It's really a matter of what you like to look at. Curved screens are more expensive and more of a hassle to setup. If you don't have a specific reason to go curved I'd stick with a flat screen to save yourself any headaches down the road.