Many pros use the PD because Babolat pays them big bucks to use it. Many people use the PD because they see the pros using it. Babolat, like Nike, is mainly a marketing company and they are both doing a great job at it. Yes, endorsements do work and they do influence the buying public's purchasing decisions. That's why some hot basketball players can command $100 million dollar endorsement deals from the likes of Nike, Reebok, or whomever. They sure have to sell a helluva lot of basketball shoes to earn back that $100M don't they.