I've had the DGM 27" for nearly 5 months. I've used it for gaming and web browsing. I am currently playing Borderlands 2 and Guild Wars 2. I don't notice any lag or ghosting. I've never played on a 120hz monitor but I know that some people can tell the difference, especially when playing FPS games. I would expect the picture quality on the DGM IPS panel to be superior to the Asus but it really depends on whether you will miss the 120hz refresh rate.