I'll personally never buy another G-Sync monitor if that's any help. For sure it works and makes games run smooth but it's just another thing that could possibly fail and kill your monitor. My PG278Q one day suddenly had distorted text so I disabled G-Sync and helped for a few hours then started again. Lowered refresh rate fixed it for a few hours then suddenly full white screen of death. Come to find out the G-Sync module died and took the whole monitor out with it. IMO, G-Sync is like paying extra for somebody to come by in a year and destroy your monitor. I've never had a monitor die so fast on me, especially an $800 monitor.
Choice is yours but I don't trust it. I know a few others as well that had the same thing kill their monitor.