Good afternoon, (For those that don't want to read the detail, my main question is: Is a 15" rMBP too bulky to comfortably take with me everywhere?) My current laptop (a 2.3kg, 14" Windows laptop) is dying, and I start Masters (in Statistics) in two-and-a-half weeks. Since everyone in the School of Mathematical Sciences uses Macs, I thought I'd buy one myself (so I can use the same software as my supervisors, etc). I'll be taking it with me nearly everywhere, including to and from uni, even though I won't be using it at uni that much because I'll have my own iMac to use at uni for Masters. I'll also be using it at home as a "desktop replacement," using one or two external monitors with it. I chatted to one of my supervisors about my upcoming purchase, and he said that his Macbook Air (mid 2013) is fast enough everything we'll be doing for the project. However, I realise that buying a Mac is an investment, and I want to make it future-proof. Consequently, I'm leaning towards a 13" rMBP with 512GB SSD, 16GB RAM and i7-4558U 2.8GHz CPU, for portability as well as having decent grunt, the ability to run virtual machines and dual-boot (in case I need to use something Windows-based). However, I keep seeing comments essentially saying, "don't bother getting a max spec 13" rMBP, get a low or mid-range 15" rMBP instead as better value for money." This makes sense, as the 15" rMBP is far better at multi-core processing, having quad-core processors compared to the dual-cores of the 13". Also, it's not like the 15" rMBP is a 5kg Alienware brick - it's only 2kg, 300g lighter than my Windows machine. What's my concern, then? Purely the footprint and bulk of the 15". On planes, in cars, at cafes, etc, I'd much rather a 13" laptop. But I'm worried I'll regret not having a quad-core processor in the future - I'm keen to digitize my DVD collection soon, and video encoding will be a lot quicker on a quad-core processor. Or is my future self just being impatient? Thanks guys, Andrew.