In this video you can see a Hanvon reader, and just look at the response of the writting...
http://www.youtube.com/watch?v=dcN28YIxVZc
I was thinking about getting one of this instead of the prs-600,but well, i finally prefered the Sony one because of its dicctionary and its look... I'm sure in the future models they'll make this writting option better, its just a matter of time... =)