I bought a retina-MBP, it had serious and annoying ghosting (a common problem). I asked apple to repair it (I have Apple care), they administered a spurious test (my opinion, see results below), said it was within their tolerances and refused. I, rather disappointed, complained at every possible level to no avail.
This is a real problem with my laptop that affects my use of the device every day. I am now having to pay myself to have the screen ‘replaced’—not ‘repaired’ as Apple's representatives are keen to point out.
See also my previous post on Retina MacBook Pro Burn-In.