horndude 77: I just installed the latest unstable release (running Ubuntu linux), and used musicxml2ly to convert the .xml file exported from Finale. The results aren't quite right:
http://www.simonbielman.com/pdf/sonata_2_lilypond.pdf
Everything's fine at first, but at measure 84 something really funny happens in the left hand, and the entire staff gets off by at least one measure for the rest of the piece. At the beginning of the second movement, it's WAY off. Plus a trill I've written now goes on forever

And my accidental spelling wasn't preserved, hmm...
But I guess all these problems are the XML converter's fault. The notation itself, besides the odd placement of rests, looks pretty nice. Maybe I'll have better luck getting lilypond code to compile in this version...