When I check how many people don't follow Kim Kardashian: http://www.realitycheck5000.com/... I get the same number as the one for people who don't follow me: http://www.realitycheck5000.com/... Given that there's a 140 million follower difference, that doesn't seem right.
Pros:Nope.
Cons:It doesn't do the only thing it says it does.