I like epub, and it is the Sony readers more open format that pushed me to by Sony rather than Kindle/Nook. As someone else said epub is very Calibre friendly, and that is important to me as well. The LRF is wonderful (for example the free ones available here at MobileRead) but is readable only on the Sony. LRX of course is DRM so it is of Satan.
And yes, it is nice to tear the DRM out of epub
