Monitors aren't all made equal. Sure, there's all the usual differences in resolution and contrast, but it also matters how fast your monitor can refresh the image delivered to it, especially if you're playing a twitch shooter like DOOM or a fast-paced MOBA like League of Legends. BenQ says its new 24.5-inch XL2540 is the monitor for esports thanks to its phenomenally fast 240Hz refresh rate.