Very interesting and helpful, I can use this product in the next project I have coming up. Thanks.
I do think the article would be significantly enhanced by adding a screenshot of the rule building process. Until I download and run the code, I don't have much of an idea of what that process actually looks like to the user.
EDIT: I've returned for a further look at the article and this time noticed the link at the end of step 8. That link provides an excellent example of the product in action.