It may be a bit complicated to setup at the beginning. Also seems to give problems with some images that get split.
But overall I think it does a decent job. You can always open the original pdf on the tablet side to see the original paper while annotating the converted version

For example check this converted paper:
http://dl.dropbox.com/u/4794661/Para...ce_simgle2.pdf

and compare with the original:
http://dl.dropbox.com/u/4794661/Para...0Resonance.pdf