No cons i can see yet, i’m using Gsync and Vsync although fs2020 is so low in fps i doubt Vsync will ever trigger, still, i cant see any issue with leaving it turned on. Note though that they are only “Gsync compatible” and the lower framerate limit is pretty high for Gsync to lock.
I can see no signs of any tearing though no matter how aggressive I pan the camera so it all seems very happy. I do have a couple of other apps to test it on but have not had the time yet as FS is my main one, these being BeamNG and EuroTruck Sim 2, I have tried GTA5 on it and it runs at full ultra very well 