How does this compare with Prince?
Where Prince wins is in its support for CSS @page extensions (having pages with different margins etc.), it looks much more adapted to professional publishing. There are certainly many more advantages related to typography but I don't know them.
Link to Prince:
Real issue is Prince is the only browser that supports full print CSS, none of the major browsers seem to care about better print output anymore.
Interesting random factoid: Prince is (was?) written in a language called Mercury [1], which is kind of a statically typed Prolog. Research into Prince turned me on to state-of-the-art logic programming, so I'm thankful for that as well. :)