I purchased one of the very first retinas that my Apple store got. It wasn't a problem at first but in the last couple of weeks I developed the image retention problem pretty badly, enough to be noticeable just switching from pages to Safari. I had an LG screen Took it in today and watched them perform the diagnostics on it including one called image retention test. That test consisted of showing a checkerboard pattern on screen for 4 minutes followed by a 30 second countdown on a black screen. In my case the pattern was still quite visible so they agreed to replace the screen. On the plus side, the turn around time was outstanding, I dropped it off first thing this morning and the called me just before dinner to say it was ready. Brought it home and the IR is definitely gone. However the overall look of the screen does not have quite the "pop" the older screen had. It could of course be a placebo thing and all in all I'd rather have this than the ghosting. And yes, the replacement is a Samsung Screen. One other interesting things was that the genius girl did not seem surprised when she saw my purchase date. Regardless, I'm a happy camper and was VERY impressed how quickly they fixed it.