I just received my reader today and haven't put it down yet
I've just finished converting over a gutenberg text to a pdf. I've aimed at getting it to look as similar to a purchased ebook as far as font size and layout.
So far I've not noticed any of the problems of slow opening/page turns that others have mentioned. I just put it on the sd card via windows not the connect software - maybe that makes a difference.
File is attached. (final pdf is 497 pages)