Birdsong I do know increases the slickness of the action. In the case of Birdsong Black-T the color might wear over time and a lot of use, but the metal is still protected at the molecular level as I was told. Might be a marketing gimmick, but they do stand behind their coatings with a lifetime warrenty.
As for Teflons, Ceracotes, and other baked on finishes I cannot speak to their effectiveness. Perhaps someone else might be able to.
