Gah! I spent weeks with this decision already and still can't make up my mind 100%. On one side you have the 13 inch with : 1) 3 more hours of battery 2) louder speakers 3) SD card slot 4) Bigger screen 5) Bigger trackpad On the other hand you have the 11 inch with : 1) 0.6 lbs lighter 3) 33% smaller physical footprint for better portability 3) $100 cheaper It looks like a landslide for the 13 inch, yet some of the advantages it has I don't know if they really apply to me (such as the SD card slot). Others, like the 3 additional hours of battery life (12 vs 9) make me wonder if I would ever really be on a computer 9 hours or more in a day to begin with, somewhat negating its advantage. I told myself before ordering "you're going with the 13 inch since its will be your only computer and you want the bigger screen to work with so that have enough space to multitask and you aren't straining your eyes working on a 11" screen for long periods of time. You are also going with the 13 inch due to the higher battery life, so that 3 years down the line you will still have good battery life while the 11 inch might have gotten worn down." Yet why is it then that I still want the 11 inch MBA? Why is the smaller machine so compelling to me?