I tried it. Result was my information "May" have been compromised. Sounds like a come on to get you to enroll. Free now but I bet it will be a paid service later.
I already have two services after a theft last year. I received an Email last year about one of my credit card being sent as requested. Checked and it was an additional signer being mailed to Florida. Immediately cancelled it. Found out they had issued another previously to another address in Florida and there was over $8,000.00 on it that was past due. Got that one cancelled and removed from my credit bureau records. They had my name and SSN. Paying for ID production now.