I am deciding between a MBA and rMBP. I think the retina screen looks great, but I have heard rumors that the intensity of the pixel display is more likely to cause headache than the normal display. Does anyone have experience with this? I am generally sensitive to electronics and screen brightness, but using a computer on daily basis is a necessary reality for me. 2nd question: When the rMBP 13 is rated at 9 hours battery life, is that at full screen brightness? Thanks!