I have never thought those ads legit, but I went to a couple websites several years ago out of curiosity. They're so vague as to be worthless. You don't get anything even approaching what could be called information unless you call the number on the website. I never called, as I was never that curious.
I have heard that they basically hit you up for money for more information, then what you get is basic generic stuff that you either already know or can download from a government website for free.