1) Neither reader can read from zipped files.
2) Can't change the TXT font with Sony, possible on Cybook.
3) Sony's features missing on Cybook:
- It has extra buttons and that makes menu navigation faster.
- Sony's LRF format can be more rich that Cybook's Mobi. E.g. it supports headers/footers, different fonts in one book and embedded fonts.
- Sony can read RTF files without conversion.
- Page number display when reading.
- Books can be sorted by Author or Title.
- Internal hyperlinks in PDFs are supported.
Cybook's features missing on Sony:
- Mobi support, including DRM.
- Dictionary lookup (only in Mobi books, needs purchase of a Mobi dictionary).
- Books can be sorted by file path (allowing implicit grouping by folders).
- Supports toggling of full justification and text emboldening.
- User TrueType fonts can be used.
4) My guess that Cybook is expensive because they think they can get away with that price. So far it seems they're right since they run out of stock each month.
