While you can use ELMB at 144hz, I feel the monitor’s motion is better at 240hz than at 144hz w ELMB. ELMB also reduces the brightness of the panel, which can make using the feature a non-starter for some. TL;DR For the price this is an excellent 240hz gsync compatible monitor which has surprisingly good picture quality.

https://www.amazon.com/XG248Q-Compatible-Adaptive-Esports-Monitor/dp/B07GR9VXBF