As far as the sunshine issue goes, the Nook Color actually has a very bright screen, noticeably brighter than more modern 7" tablets like the Nexus 7 or iPad Mini, so would perform slightly better in sunlight, although still nothing like an eInk device.
And the battery life issue is real, but not in the weasel words that the eInk manufactures claim. Lasts for weeks (if you only use it half an hour a day). A tablet would also last for weeks if you only used it half an hour a day.
A modern eInk device will probably have between 2 and 4 times the endurance in reading hours of a modern LCD device, depending on the exact model of each. Significantly better, but not orders of magnitude better.
eg for Amazon devices:
The Kindle touch is quoted as up to 60 days at 1/2 an hour per day = 30 hours.
The Kindle Fire HD is quoted as up to 11 hours.
So roughly three times longer.
Last edited by murraypaul; 11-10-2012 at 10:44 AM.