In terms of the clarity of the text, it is fine. In terms of the size of the text, it will be too small for most publications.

On the zoom settings, it seems to keep the zoom setting and position. The problem is that you need to pan to the right in order to go to the next page.

There is a ghosting bug when zooming and panning in the current firmware. It can be circumvented by setting it to refresh on every page turn.