We have a nice, big comparison image of the screen next to the H2O 2 here
http://aldus2006.typepad.fr/.a/6a00d...84c010e200c-pi
Looks good in terms of contrast. Doesn't have the slight darkness of the H2O 2, but it's a shame that e-Ink has been static in terms of developments over the past few years.
I might be tempted to replace my Aura 2 with it.