Some additional comments:
i) the notes are stored at the zoom level you're at, and if you change zoom level, the written annotations may appear/disappear correspondingly. This is a current limitation. You may want to use typed annotation notes instead (they appear as markers on the eInk side and the text on the LCD side).
ii) The eDGe currently does not support landscape on the eInk side. We hope to see it one day, though.
iv) Generally, yes.
v) The eDGe does annotations (written and otherwise) extremely well because it was specifically designed to do so, and I believe it does it better than any other eInk device on the market today.