I'm sure there are tons of 11" V 13" threads but I wanted a bit more personalized opinions. I'm writing this on a 15" Acer with an i5, 4Gb RAM, 500Gb HDD, 1Gb VRAM - a big jump from the MBA or even a lower end MBP. I want an ultra portable and the MBA was an obvious choice compared to ultrabooks. The problem is I'm not sure about the screen size... 11" Pros -Sexy Body -Smaller -Sexier trackpad Cons -Less battery -Smaller Screen -Less HDD and/or CPU performance -Vertical Scrolling -Sexy but unusual aspect ratio 13" Pros -More Powerful -Huge battery life -Higher resolution -Larger screen cons -Square shape -Larger I guess in an ultra portable size does matter but there has to be a point where I'm just going crazy... If anyone has any experience please share!!