CashUnclaimed.com - Has anybody ever used this service...

Have you ever heard of this site... CashUnclaimed.com ? I have heard people talk about these types of sites, but don't know anybody that actually used it and got money back. So I checked my name and - Nope, Nada, Nothing for ol' me! I thought I would try my step father that passed away last year. Sure enough, his name came up with a little $$ owed to him. I called my Mom and she pulled up the site, but was not comfortable going through the process. Apparently you have to sign up for some program which cost money and yadda, yadda, yadda. So I am looking for someone that has used this service. Is it worth it?