Having both, I think I can give a fair comparison. Here are my opinions/thoughts/observations
Cybook -
Pros;
- Discionary support
- Any True Type font and includes all variations (bold, italics, etc.)
- More mature software
- Better implementation of Mobipocket support
Cons;
- Need to do better on SW updates and fixing known problems
- No page numbers. Instead there is a bar indicating how far into the book you are
- Slow booting
EZ Reader (as I understand it, essentially the same as BeBook) -
Pros;
- Heavier & appears more sturdy - also a little thicker
- More rugged (i.e. stronger) seeming leather case
- Supposedly has the ability to add True Type fonts (more later on this)
- Nice hardware interface (better buttons & more of them, etc.)
- Shows actual page numbers
- Boots quickly
- Allows folders and sub-folders (this is good to categorize your books as you want them)
- Bookmarks show a few lines of text (at least for PRC books)
- Working hard to satisfy customers
Cons;
- Each format as its own (slightly different) look & feel interface (i.e. there seems to be little or no consistency between the interfaces of the different formats)
- I've had several hangups with PRC books - very little experience with other formats)
- Books often open at some previous place rather than where you were last reading
- Page numbers (last page) sometimes gets confused
Bottom line, I like them both. I think the Cybook is currently the better but the EZ Reader has better potential once they get the SW working correctly and there is better consistency among the various formats.
I apologize for the length of this post. I usually go with shorter answers.