Got a complaint about something you bought? Or are you thinking about buying something but wondering how well the product worked for previous buyers? There are numerous complaint Web sites. However, as with the items criticized on the sites, some of the sites are better than others. According to a report by the Consumer Federation of America, one of the best complaint sites is My3Cents.com, which was lauded for its organization and links to the Better Business Bureau and state attorney general offices. Other recommended sites include Complaints.com and Complaintsboard.com.