Is 1080p sharp enough on a 27-inch monitor?

It is usable, but pixel density is lower than on a 24-inch 1080p screen, so text and fine detail look softer. If sharpness matters more than frame rate, a 1440p panel at this size is the better fit.

Does this monitor reach 240Hz over HDMI?

High refresh rates like 240Hz generally need DisplayPort on monitors of this class. Use the DisplayPort input and a capable cable to get the full refresh rate; HDMI may cap lower depending on the version.

Can I mount it on a monitor arm?

Yes. It has a 100x100mm VESA pattern and weighs 8.8 lb, which most arms and wall mounts handle easily.

Is the HDR worth using?

HDR support here is basic, without the brightness and local dimming of premium HDR displays. Expect a modest boost in compatible games rather than a dramatic picture upgrade.

Does it work with a PS5 or Xbox?

It connects over HDMI, but consoles cap output well below 240Hz at 1080p. You get a working picture, not the full benefit of the panel's refresh rate.

Is it good for anything besides gaming?

IPS viewing angles and 8-bit color make it fine for everyday work and video. The lack of a pivot and USB hub limits it for portrait or docking-heavy office setups.