Lifelock is being sued, according to Dave Ramsey. Dave refused to accept their ads, because he knew the strategy they were using wasn’t going to work.
http://www.bizjournals.com/phoenix/stories/2009/05/25/daily57.html
Dave’s information was basically that Lifelock “protects” you by placing a fraud alert on your credit report, even if there is no actual evidence of any impending fraud. You need a better reason than “Lifelock’s ad scared me”. The other problem is that according to Ramsey, 80% of credit cards are approved without checking the credit report. So even if there is a fraud alert on your credit report, blocking the credit report does not ensure that your identity isn’t being stolen.