Nvidia Fast Sync Better Than G-Sync and V-Sync?

With Fast Sync nvidia introduced a new technology that should fix the tearing issue while not decreasing the responsiveness of the game. How well does it work and what are the pros and cons of v-, g-, free- and fast sync? Or should you even used one of these? An input lag analysis in CS:Go will shed some light on these questions. ► Support Battle(Non)Sense: ► G-Sync vs. Free Sync: ➜ Previous video: