Hey guys, apologies for contributing yet another comparison question, it's just 1.5k is a lot of money, so this process will help ease my mind. Basically I'm looking at 2 different models of the rMBP that are the same price, The 15" / 16 Gb / 2.5 Ghz Quad i7, and the 13" / 16 Gb / 3.0 Ghz Dual i7. I'm doing scientific research, so I use matlab, mathematica, and other multicore programs (however, this will mainly be done ssh'd on national supercomputers, so my laptop will mainly be used for debugging purposes - so the extra cores may not be so useful). I'm currently using an old 2011 13" MPB, and I've been more than happy with it, however I feel like I'm getting more value for my money if I go for the 15" (especially as the new 15" is the same weight as my current 13"). Any advice one users of either system would be appreciated!