I'm sure this has been mentioned here, but I don't really want to browse 28 pages of thread, so I'll just say it again.
This reader has one very fine option that no other reader seems to offer (at least as far as I know) - it has a setting which enables users to switch on/off the publisher embedded formatting in ePubs. This would seem to be the perfect kind of option for an ePub reader, (finally) making use of the inherent features of the ePub format.
As an example, compare the very fine version of Jerome K. Jerome's
Three Men in a boat available on this site. It is a superb piece of ePub creation, but very often the crappy ADE display settings force the book to display poorly. Bluefire allows you to fully tailor the way a book is displayed (good for when the publishers screw up or make bad choices - very common) or to select the publisher's formatting (for when they get it right, like this version of
Three Men in a boat).
Attached are two photos comparing Bluefire display of this eBook versus Stanza display. Notice how Bluefire display the Fontin font embedded in the Jerome K. Jerome ePub book.
In addition, for PDF eBooks Bluefire seems to do a far better job of rendering than other iPad apps, especially with troublesome PDFs. I had a text book that had some poorly formatted diagrams that basically didn't display properly in any reader other than Bluefire (GoodReader, iBooks, Bookman, etc.). Also I find the zooming and page manipulation much nicer for PDFs than in any other apps.
Just thought I'd share these bits of info for those considering this app - it's worth a look.