I had the 13 inch w/ TB for about two weeks and I loved it. The portability was great but I did find the screen somewhat small in some circumstances, so I returned it to try the 15. So far it's been great, but it is somewhat heavy/wide, and does get a little warm. I'm a senior year college student and will be mostly bringing my laptop to the library and classes. I'm majoring in computer science and minoring in art/design so I will be using graphically intensive programs like photoshop, maya, etc. I had a 2009 MacBook Pro and photoshop was tolerable on that, so I have no doubts I'll have issues on the new 13. The thing is I've never used Maya and I don't know how it would run on the 13, or if the 13 is good enough for my uses. Today is the end of my two week return period, so I kind of have to make a decision now and I'm struggling. Perhaps I'm being too picky on the portability aspect from reading everyone's opinions too much since this is my biggest concern. I use my laptop often on my lap to watch movies, I also use it on the desk at the library and hooked up to an external monitor. So I'd really only be lugging it around my house/taking it to library and class. Based on my uses, which do you guys think would be the best option? Since I'm graduating in a year, I feel like I should not entirely base my decision off getting a "college laptop".