I like my curved ultra-wide. I didn't at first, but my brain has very noticeably adapted to where curved things on it appear straight just fine. I noticed this when I went back to the office after a few weeks absence, where I have a regular flat pancake screen in 16:9, and straight text looked CURVED in the opposite direction!
Brains are weird.
I've noticed the same when I tried to replace my ultrawide 34" with a Dell U3225QE for my home office the other day. I really wanted to like the Dell since I love the specs, but my head would hurt from the perceived bulge in the middle of the screen, where the curve used to sit farthest before. Stupid brains, really.
I use a 49” LG ultrawide (5120 X 1440).
It’s curved, and I have no issues at all with it.
I thought I would, at first, but it’s been fine.
But it’s also only curved horizontally. Not sure how it would be, if it were square.
I got a curved 5k2k lg display for games, and every time I switch to work monitor (5k regular flat lg), it feels like I'm looking at an old CRT that's bulging out at me. Such a strange sensation. I do like the curved display a lot however.