As we wait for connectivity and GPU horsepower to catch up to the new technology available in monitors, those who are upgrading face a choice.  If you want incredibly high refresh rates then you have to sacrifice resolution, whereas if 4K is your need then you will have to be satisfied with lower refresh rate ranges.  The ASUS ROG SWIFT PG258Q is one of the former, offering 1080p resolution but with G-SYNC capable of a refresh rate reaching 240Hz.  That extremely high refresh rate also requires the use of a TN panel, so if you prefer 4k IPS then this display is not the one you are looking for. 

Kitguru provides a full review of the monitor here, including a look at the new style of asymmetrical ROG stand which can tilt farther than you might think at first glance.

"Gaming monitors are clearly going through a bit of a growth spurt, and ASUS is a company particularly focusing on this area. The ROG SWIFT PG258Q is a 24.5in screen with a whopping 240Hz top refresh and NVIDIA G-Sync, plus a host of other features specifically tailored for serious gamers."

Here are some more Display articles from around the web:

Displays