This isn't a review (since I don't have it in a pen yet), but this is a link to my wife's lab-blog. She was behind Tyler's naming of this ink, and he gave her a bottle of it at the DC show. Follow the link to check out the story, and check out some soil science while you're there.
I'll have some reviews up soon. School started this last week, and I've been up to my ears in work. I'll post when I recover a bit.
Word.
Mike