The fact that the Orizon doesn't have a dictionary is really disappointing (not being a native English speaker but reading lost of English books), it could be my reason for buying the Sony PRS 650 instead.
I've found a video on YouTube about the Orizon, it's in Italian but at least we get to see it in action. And I really like the close-up of the screen.
http://www.youtube.com/watch?v=3EaF8AfXVmI