I'll be interested in hearing how Schulke's book compares to Paul Beyerl's Compendium of Herbal Magick. Of course there's no comparison in terms of the way Schulke's book was published. I'm more interested in knowing specific attributions: how each author describes the magical properties of the various herbs, plants, trees, etc.
The one thing that does put me off somewhat are the biblical references: fallen angels, Cain and Abel, etc., but I guess that's the Western Mystery Tradition for you.