I saw that my Best Buy got some more rminis, so I figured it would be a good time to exchange my rmini for another one before they sell out, cause mine has dust under the screen (every ipad ive had has had dust, its just the matter of how much is too much), pretty bad retention and 1 dead pixel. No yellowing at all. When I got there, there was a guy at the desk swapping out ipad minis. There was a stack of about 10 opened ones next to him as a couple Best buy persons was carrying them to the back to ship back to Apple. I noticed he was powering on each one and testing for image retention and yellowing cause i saw the checkerboard! He would open one to test, see retention, then put it back in the box and the Best buy guy would hand him another from the cage. I decided to hang around for a bit cause I initially didnt know what he was doing. Finally after 17 rminis, he found one without problems! Only bad thing is that the store only got under 20 or so and he went through the entire stock and now Best buy is sold out. No more to sell to customers 16 of them going back to Apple. My new one still has retention, but no dead pixels and no dust (what a shocker!), and nice whites, no yellowing. Ill just live with it for now, seems to be better than the one I brought in. And finding one without retention is like asking to hit the jackpot, just not gonna happen.