So a week ago I bought a 15" rMBP 2.5 i7, 512 ssd, 750m, 16gb ram. I find it too big for work since I visit about 5 businesses a day, and the battery life is ok. I basically browse the web, open PDFs, spreadsheets, nothing that pushes the processor, and at home I plug in to a thunderbolt display. feel this is too much of a computer for what I do. My local Apple Store just got the new rMBP a 13" in stock and I was thinking about going to exchange it, not only will that be a lighter laptop, I'll also save about $700. What do you guys think about this, am I making the right choice by exchanging it or should I keep the 15".