It certainly blocks spam, but it blocked my own comments (while logged in as admin) as well. The url for my account didn't contain the keyword that was given as the basis for rejection.
So, unusable for me, unless I check every comment - but that's no better than moderating every comment anyway, and has the disadvantage of comments being deleted after 7 days.
The email also doesn't tell which blog post (neither title or url) the comment was made on.
But much potential, so I'm giving 2 stars rather than 1.
You must log in to submit a review. You can also log in or register using the form near the top of this page.