Last week I got my BTO 15" rMBP with 256/16/2.6, I'm still on the 14-day window, today Apple dropped the rMBP prices and I can return mine and get a new one with a maxed out 512/16/2.7 setting, the only benefit for me would be the increased storage of 512Gb SSD at a lower price since I won't really notice the difference of speed on the CPU... luckily I got a Samsung panel with my current rMBP and I'm afraid of getting a LG panel with image retention if I exchange it for a new one, I know I can exchange it again if I get a LG panel until I get a Samsung panel but I would have to demonstrate/convince Apple that the panel is not good. Recently I had to exchange a Sony VAIO and I'm a little fed up with exchanging, I'd love to have the 512Gb at a lower price but I don't' wanna deal with Apple over and over again until I get a Samsung panel, and its impossible to know it until you unbox the laptop, what would you do?.