I bought a customised Retina MacBook Pro 15 inch for £2000 back in June and have had numerous problems with the display (image retention) resulting in two replacement screens and a replacement computer and I am still experiencing this issue even worse than before. I'm planning on taking it to the Apple store soon for another genius bar appointment do you think they will let me exchange it for a 27 inch iMac of the same price if I ask, as i'v had so many issues with my current mac.