As a Realtor I've been pitched these in-depth data mining services before. They tell me that their online service can essentially bring up a caller's entire "life story" while I am on a phone call with them. I declined to buy in.  And I'm more mindful now, that many people, companies, and organizations that are calling me (or whom I call) are quite probably looking over all of my personal information, abbreviated credit and buying habits, background, and more while we talk. People who may not be qualified to make me a ham sandwich- now have access to all this personal and "private" data - displayed on the computer screen in front of them. We wonder why identity theft is so rampant. It's becoming easier all the time for them.  There's never been a better time to use caller I.D. block in my opinion.