I had scores of 600, I followed their advice and opened a credit card (unsecured) that they suggested. One month later my score dropped almost 50 points. After the 2nd month I lost another 50 points! I get 10 plus emails from them every day trying to get me to open more cards.
Clearly they running an affiliate program for the sole person of getting you to open cards so Credit Sesame gets their cut! Total scam ripping off people who are trying to build their credit.