Here is my stigma against anything above 13-inchers based on the past: 1) 15 inchers are too heavy to carry around. they usually also have heavy chargers. what is the point of a laptop if its cumbersome to carry around? what if you want to carry it around all day at classes/work, in your gym bag on your way to a friends house, or take it to the kitchen to check a recipe or use it in bed? 13 inchers are perfect because of their lighter weight. you can carry the machine with one hand without feeling like your wrist is strained. 2) battery! the bigger screens kill battery much faster than the smaller machine turning 15 inchers into power outlet abusers! 3) footprint... they usually are thick, have a large bezel and a lot of depth. But enter - Retina MBP. Can it be... could this be the worlds first truly portable 15-inchers? or am I kidding myself in thinking that? They called 15 inchers dekstop replacements because they were meant to sit on a desk. not be carried around and used everywhere. Is this machine putting a stop to this belief? Because no reviews mention this - none of them mentions how mobile it really is. thats whats important to me. I had a 15 incher back in 2006. it weighed 3,5 kilo (around 7 pounds), had 1,5 hour battery (before gpu disabling), massive power brick and it had a crazy large bezel. could have been a 17 incher. Are any 13-incher believers thinking of converting?