Hi, I'm weighing up the price / performance / convenience balance between the various configurations of 13 & 15 inch rMBP. My use case is for daily use of productivity software, part-time software development, and running (heavy-weight) virtual machines. I feel I need a 16GB machine for the VMs. I need to carry the computer with me every work day, and often travel on public transport and economy-class airlines. I had initially thought to replace my i7 MBA 13 with a rMBP 13 2.6GHz/16GB/256GB, which would give me the extra RAM, retina screen and more ports, but be otherwise roughly equal in power to my current MBA. However, I'm starting to weigh up the pros and cons of the entry-level rMBP 15: Advantages: More powerful CPU, particularly for running VMs Bigger screen (although scaling can compensate to some degree) Better graphics (Iris Pro vs Iris) Disadvantages: More Expensive - c. AU$400 more than 2.6GHz i5 rMBP 13 (but only AU$100 more than 3.0GHz i7 rMBP 13) Significantly heavier. Bigger footprint - may be less comfortable on public transport and not fit on economy airplane tables. Less battery life Have any of you made the same decision? What did you choose, and why? In particular, if you carried your rMBP to work every day , what would you choose? Thanks for your input!