The Biggest Problem with Google Glass: the LCOS display, Washington Post Reporter nails it in one sentence. That's rare for the Post, give her a Pulitzer

"On the hardware side, Glass tended to heat up — sometimes after just 10 minutes of use — and needed to be charged multiple times a day. "

http://www.washingtonpost.com/business/a-week-behind-google-glass-reveals-the-world-may-not-be-ready-for-the-high-tech-device/2014/05/02/178939be-cfad-11e3-937f-d3026234b51c_story.html