Hi, I was unfortunate enough to receive my first 15" Retina with a couple of dead pixels, that one was replaced for a new one. That one has somekind of serious heat problem and will also be replaced. For the inconvenience Apple has given me two options: 1. I get a little bit of money back 2. I upgrade to the 2.6Ghz version which I can get at a discounted rate. I can keep using the first one with the dead pixels (that they have not picked up yet) until the new one arrives. I would love to have the 512SSD, actually that would make my life a bit easyer. If I could have the 2.3 with a 512SSD it would be quite obvious I would go for that, but unfortunately that's not an option so I have a few questions. How is the 2.6 compared to the 2.3: - with the battery? - heatwise?