I bought an iPhone 6 from Apple.com and I've had dead pixel issues:
------ PHASE I ------
First phone had 1 dead pixel in the lower right corner. Called Apple, they sent an exchange.
Second phone had quite a few dead pixels all over. Called Apple, they sent an exchange.
Third phone had 1 dead pixel in the left center.
------ PHASE II ------
I brought the third phone into the Apple store to exchange it yet again, but because all this exchange shipping with Apple took time they couldn't exchange the phone in store so I settled for a replacement screen:
Replacement screen 1 had a dead pixel. They replaced it again.
Replacement screen 2 has no dead pixels. Went home.
------ PHASE III ------
I haven't activated any of these phones yet, I've been looking at the white on the language screen the whole time.
When compared side by side in a dark room using a bright light achieve maximum brightness from the display:
The first phone (with the single dead pixel in the lower right) gets a bit brighter and looks whiter.
The replaced screen phone seems to have a slight yellow tint and doesn't get as bright.
------ QUESTION TIME ------
Do I:
Keep the slightly yellow/dimmer phone?
Keep the bluer/whiter phone with one dead pixel?
Send both back to Apple, strong arm Verizon into resetting the upgrade eligibility (since I haven't even activated anything) and try again in-store (and risk these problems again)?

------ PHASE I ------
First phone had 1 dead pixel in the lower right corner. Called Apple, they sent an exchange.
Second phone had quite a few dead pixels all over. Called Apple, they sent an exchange.
Third phone had 1 dead pixel in the left center.
------ PHASE II ------
I brought the third phone into the Apple store to exchange it yet again, but because all this exchange shipping with Apple took time they couldn't exchange the phone in store so I settled for a replacement screen:
Replacement screen 1 had a dead pixel. They replaced it again.
Replacement screen 2 has no dead pixels. Went home.
------ PHASE III ------
I haven't activated any of these phones yet, I've been looking at the white on the language screen the whole time.
When compared side by side in a dark room using a bright light achieve maximum brightness from the display:
The first phone (with the single dead pixel in the lower right) gets a bit brighter and looks whiter.
The replaced screen phone seems to have a slight yellow tint and doesn't get as bright.
------ QUESTION TIME ------
Do I:
Keep the slightly yellow/dimmer phone?
Keep the bluer/whiter phone with one dead pixel?
Send both back to Apple, strong arm Verizon into resetting the upgrade eligibility (since I haven't even activated anything) and try again in-store (and risk these problems again)?