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It really depends on what you're doing and how you normally use your screen real estate. If you're used to having two screens with the bezels meeting in the centre, a large curved screen eliminates that bezel. This is great if you find yourself stretching window across the bezel currently, but if you value the physical separation two screens provide you may want to rethink.
At home I have a large curved screen (Acer X34A) combined with a vertical Dell U2414H. The curved screen is great for games and video content and is marvelous for doing graphical work (I use GIMP, but I imagine Photoshop similarly benefits) while the vertical screen takes care of reference material, chat, what have you. For anything else, including casual browsing, it's not so great. Websites stretch too far, reading text that wide is a pain and generally things are happier when I pretend it's two screens and have two windows occupying half of the screen each. Still, I like the setup.
By contrast, at work I use two screens (27" Apple Thunderbolt), one facing me directly and one off at an angle. I do "IT" so I spend most of my time in a text editor, having that front and centre physically separated from the rest of what I occasionally need to pay attention to (email, internal chat, etc) works nicely. I wouldn't want to replace that with a single screen even if I had the option to.