Heres the simple test I use to determine if my screen is good:
Does the screen exactly, 100% match the display model screens in both color tint and evenness? If no, take that thing back.
Most of the time, it's no. Apple ships a ton of inferior screens. I got lucky with my 5S and finally got a screen like the floor model. This one was ordered through a corporate account, so maybe they delegate the highest quality screens to big name accounts, and dump the trash on the masses.
Does the screen exactly, 100% match the display model screens in both color tint and evenness? If no, take that thing back.
Most of the time, it's no. Apple ships a ton of inferior screens. I got lucky with my 5S and finally got a screen like the floor model. This one was ordered through a corporate account, so maybe they delegate the highest quality screens to big name accounts, and dump the trash on the masses.