Im sure all are aware of it, but if you are not sure here is what Im refering to.

https://forums.androidcentral.com/lg-v30/835245-quality-issues-v30s-oled-display.html

https://www.google.com/search?client=firefox-b-ab&q=lg+v30+screen+graininess&spell=1&sa=X&ved=0ahUKEwj2182Q-5LaAhVHvrwKHQKwDjkQBQgmKAA&biw=1280&bih=579

I really like the v30, but Im worried about ending up with a lemon.

The Graininess sounds a worry if you google it.