Hi, I've recently tried to buy a MacBook Pro Retina 13" and after exchanging the device four times I finally got a fifth copy which screen I would begrudgingly consider "not too rubbish" in terms of luminance and colour homogeneity, with a moderate amount of bleeding (and that's only relative to Apple's own TFT non-retina laptop screens, which aren't exactly brilliant either, not relative to a pro monitor). I find Apple's manufacturing tolerances with those retina displays to be absolutely abysmally dreadful (only 2 out of five has decent colour uniformity, only 2 had decent luminance uniformity, and only 1 had decent control over bleeding, unfortunately not one had them all at the same time, and by "decent", I mean "like my 2011 MacBook Air with its cheap and cheerful TFT screen"), and it actually prevented from buying an iPhone 6 as well. But I've also discovered something that's news to me : whenever I have some load on the mac, near the heat exit (at the right of the screen hinge), the backlighting changes luminance slightly and colour balance a lot : it gets noticeably colder than the rest of the screen. I suppose this is related to LEDs' behaviour with temperature change. Have you noticed the same behaviour ? EDIT : pictures in post n°6.