Acer raises the bar for high frame-rate gamers, extending its 25-inch Predator XB252 up to 27 inches and bringing with it a maximum refresh of 240Hz. At $680 (approximately £620, AU$1,050) It’s not the cheapest G-Sync monitor around, but at the moment it’s one of the few to refresh that fast. And for a TN panel, it’s pretty good.(Don’t confuse this with the as-yet-unavailable XB272-HDR, which has a completely different panel.)

The trade-off, though, is resolution, which is also the same as the smaller panel. That means you can drive a truck between the pixels — OK, not really, but it does mean that for doing things other than playing games it’s not very sharp. For games, you can use G-Sync DSR to increase the perceived resolution.
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https://www.cnet.com/reviews/acer-predator-xb2-xb272-review/