I used it for a few months and saw a little bit of movement, but not much. Maybe it was the properties that were submitted to, or maybe most of the submitted links didn't ever get indexed, or maybe it was dup content that didn't help. What I would recommend for btb would be a way for users to spin articles after clicking a few boxes on lp's back end without having to access an API ( maybe pay spin chimp a flat fee for all members to access). Also have something ping all links so they have a better chance of being indexed.