Currently my daily driver is a 2014 rMBP with 8gb ram and 256 storage. The storage is not a big deal with all honesty, neither is the CPU but I run Windows and Linux at the same time in VM so my ram is pretty much always in the yellow but mostly red in Activity monitor and use a lot of swap. I work on an app thats coded in Java and I constantly need to run it and test it at the same time on all 3 OSs. I'm having a hard time deciding between the 13 with 16GB ram and dual core i7 and 15" with the mighty quad. I love the portability of the 13" but would also like more screen real estate. I guess if I get a 15 I might as well go for the dedicated GPU since the SSD is bigger and has more CPU but does anyone know if the dedicated GPU version eats more battery power? I frankly don't really need the dGPU because I might watch some movies but I don't do any rendering or play games and I'm on the road pretty much all the time so battery is really important. Those of you who switched from 13 to 15, do you find it heavier or harder to haul?