allochi, there is also another video, which will fit very good to these videos, which you did recommend:
https://www.youtube.com/watch?v=glXRWQJOclI
The weight should be less then the weight of a m96!
And for the balance part... Maybe you can test this if you take a block of A4-paper sheets... It should have nearly the same width and height. I dont think that there is so much difference if someone is reading from a block of A4 paper or from this E-Reader.
However I dont have first hand experiences with this - it's just a suggestion.