I look forward to moving this from 'currently reading' to my 'read' shelf quite soon but this depends on when the rest of the book gets written. I've never bought an unfinished book before, but I like the concept and, after all, Dickens sold his work in installments, so it's hardly a new idea. I bought the book largely because of a single word in the title: "charming". So much non-fiction (and the medical stuff I have to read) is charmless. Let's start a campaign for charm in science writing!
“True ease in writing comes from art, not chance,
As those move easiest who have learn'd to dance.”
Pope's Essay on Criticism