The Kindle Paperwhite's battery life is only 8 days if you turn the brightness of the lights down to almost off. Otherwise, if you leave the brightness at the default setting your battery life will only be about 8 hours, or less if you turn the brightness up all the way.
Regarding the "no glare" claim, I have 3 Kindles (3rd gen, Touch, and Paperwhite) and the all experience glare, but at an much lower level than glass screen devices. It can be compared to older LCD monitors and TVs that have a "matte" finish, whereas the glass screen devices (IPad, Kindle Fire...) are more like Plasma TVs or your average cell phone.
I agree that the E Ink devices provide of much more eye-friendly reading experience and I fully promote them for anyone buying a device that will be used for mostly reading.