Biggest challenge with M92: finding the white stylus on a completely blank piece of paper. try it after reading 100 pages on the ereader
Warning: if you scriblle a lot it is a good idea to clean the tip of the pen and the ereader surface as well. It happen to me that the my pen run over a little piece of dust not sure what it was but it started scratching the screen while I was underlining a piece of text! This is more of an operational issues thatn an ereder issue!
Feature request: the configuration screen shall not close after each selection you make. It should have its own "Close" button. It is really annoying to have to go through the same sequence when you change something
For instance every time I open a document I have to configure the layout to :"Scroll Pages", set the zoom to what I need to be and to select the annotations tools that I want. For that it should be enough to open the "Control panel" once, make all the slections and close instead of having to open the Control panel EVERY TIME!