There will undoubtedly be some distortion of the picture on a curved screen, since the images are rendered as if they are flat and then 'rolled' into the curve (like printing a picture on a flat piece of paper then rolled up around the sides a bit). Probably not so noticeable when looking at it straight on, but around the edge of your vision you might see a bit of distortion
I am trying to figure out if such distortions can be perceived and if they are of any significance. Note there are all kind of visual adaptation effects so even if distortions exist they might get compensated after some time of using the monitor. This has to be compared with a wide flat monitor in which the area close to edges is seen at bigger angl resulting in less comfort. For example, when taking the existing 34" 21:9 flat and curved monitors I guess the curved one will feel more comfortable. Best of course would be test this with own eyeballs but I have yet no possibility of getting such two monitors and run with different applications. Gaming is probably no-brainer for curved but e.g. office apps???