Smartlock GFCI

Leviton states “Underwriters Laboratories (UL), a leading product safety and certification organization, issued changes to GFCIs to provide an even higher level of consumer protection. The changes went into effect on January 1, 2003.”‘sure%20lock%20gfci’

Does this mean new GFCI devices are safer than old GFCI devices?

Should all older GFCI devices be recommended for replacement? (I know SoP do not require this but just getting feedback)

Leviton has a patent on Safetylock and it is easy to look for the padlock insignia. How do we tell if other brands meet the new UL standard?

Thanks John