Read this article first http://allbookmarketing.com/2008/06/04/writing-books/write-a-novel-in-30-days-two-reviews/.
I've always wondered about these books and if they would actually help. The answer is meh. Maybe. Thought I'd pass along the link. I don't have either of these books in my library right now. She said she doesn't regret buying either one.
She's testing both books in the month of June and July at allbookmarketing.com