One of the things that those who prefer the ALP over the jetBooks was that the ALP
had a Serif font.
My ALP has the 20i version of the firmware and it is using the Adobe Reader Mobile
v.9.1.1 reading software for .pdf and .epub files. With that, any fonts embedded in
the ebook will be used, instead of the default fonts of the ALP.
If you open a .pdf or .epub file in the ALP and press the "Menu" button then you open
the  "Settings" option, you should have an  "About pdf" option. This option will
list the version of the Adobe reader your ALP is using.