well I got a promo of 1 year free from siteadvisor plus and I never have an issues with it…is free why not ;D. Beside siteadvior is base on people rating is the samething with like Avast 6.0’s WebRep. The important things is the firewall and the antivirus + antispyware preventing from get into your compuuter, and the user habit of searching doing with their computer.