I've recently purchased the Galaxy S10e. I have got to say, best phone purchase since I got my first smart phone, the Palm trio. I had the S8+ and did not appreciate the curved screen at all. I had broken 3 phones in all over the course of a year, all screen related, all would have been non issues with a normal screen.
I am very pleased they decided to bring back a flat screen. Its nice to have a case that properly protects the screen and doesnt have a lip at just the top and bottom.
I opted for the blue phone, and got a case with a textured clear backing so the color can be seen. The phone itself has worked very well. The screen looks good. Atmos works better than I would have expected with youtube videos. Even without headphones on it works pretty amazingly. I dont game much, but the few games I games I have worked without issue and the display looks nice and crisp. It's just the right size, not too small for videos and reading, but not too bulky in the pocket.
Overall, months later, I am still pleased with this purchase. That's a rare hair indeed.