Took me a few days to get used to the color but now I really like it. Sometimes I'd stare at the screen so much that I'd have watery eyes by the end of the day.. doesn't happen so much anymore. (I'm hoping this is not just a placebo)
Another app that's helped with eye-strain is TimeOut (http://www.dejal.com/timeout/). It helps to take a regular break from the screen every few minutes.