Here is something i haven't seen really discussed. I went to an Apple Store to check out the retinas they had on display before I pulled the trigger. I was watching some 1920x1080 SMAC videos at full screen to see how the interface looked on the retinas, some smpte color bars and a few sites. All in all I was on this thing fo 20/30 minutes max. I was using both the best retina setting and the 1920x1200 setting. I'll be damned if I haven't had a headache for the last few hours. Now it could have been a coincidence, not enough caffeine or perhaps someone with a voodoo doll of me... but it was enough to give me pause on my purchase. Now I plan on going back sometime next week and playing around with a retina and mimicking what i did today to see if the headache returns. If not I will probably pull the trigger. Has anyone else experienced this? For the record, I am supposed to wear glasses and haven't since 1st grade. I work double what the normal american works, all in front of a computer screen/broadcast monitors and I never really get headaches except if i skip coffee that day (I had 2 cups today). Thanks for any input. EDIT: Really? A down vote?