For your reading pleasure. Useful resource to check if a monitor works well in GSync Compatible mode.
Interestingly, they had issues with screen tearing on all their monitors, even when testing Freesync with Radeon cards.
On all monitors, the screen would usually start tearing within 1-2 fps of the monitor's maximum refresh rate. The exact same behavior was observed when testing the monitors on an AMD Radeon card, and is caused by the refresh rate very briefly exceeding the display's maximum refresh rate.
I've not noticed this on any of my GSync displays, even when using ULMB, and definitely not when using GSync. It's also something I haven't seen mentioned in monitor reviews, so would be curious to know what that's about.
EDIT: Notably, they only tested VRR using the Pendulum demo, so what they're seeing may not be representative of actual game performance.