I'm assuming my XG2402 unit is worth keeping?
It's your decision, one which is not a big deal if it's easy to exchange and return monitors where you live, and if you have the time to do so. I dislike both monitors and would rather read a book than use either for gaming or watching content since matte TN panels hurt my soul
I'm surprised that you can stand using the XG2402 after using a good IPS panel like the 24 Envy for a year.
The Acer XF240H is definitely significantly better than our very similar XG2402's, and did not have any weird menu/operation and reset issues like the XG2402, but most of its advantages are preset color accuracy and ease of use based. The Acer only needed to have its gamma settings changed to achieve good image quality for a TN while the XG2402 needs and ICC profile since the gamma and RGB levels are so skewed.
It is the XF240H; look at the top right: