Rock on with eink if it floats your boat, but I very rarely read outside, so being able to do so isn't much of a concern for me, and when I do I just use my T1 for doing so. But it has been over a year since I have done so.
Here is a good common sense article about this debate.
http://bits.blogs.nytimes.com/2010/0...e-strain/?_r=0