I have one, it's a really nice monitor, sadly there is a small "but". Sometimes, it starts flickering. I'm not completely sure what causes it, but closing the nearest Eletron app will normally fix it.

Yesterday my kid wanted to see a video of volcanos on YouTube, followed a really bright picture of My Little Ponys, the monitor managed to start flickering and retain a shadow image of the little ponies, even as I switched between laptops and power cycled the monitor. This only happens on USB-C input, but seeing as the monitor have an Ethernet adaptor and works as a USB hub, USB-C is pretty much the reason I got it.

Notes: It happens really rarely, and exclusively with the M1 MacBook Air. It might be a firmware update away from being fixed. Also Dells has an excellent return policy.

I've got a U3223QE which is the same just larger. The screen itself looks really nice, its bright, no complaints there. The stand is pretty good, reasonably tidy. My only complaint is that when it said USB-C hub I expected it to have USB-C ports for peripherals and it doesn't, only USB-A ports. My older LG has USB-C ports, so I know its possible. It's annoying because as more and more stuff switches to USB-C the only place to plug those in is the laptop itself, which means messing around with too many cables.

I have its older version U2720Q and I am quite content with it, in a multi-monitor setup under Linux, using 30 bit per pixel, and also including a Dell loudspeaker system connected to U2720Q, used for audio via DisplayPort or HDMI.

I assume that the upgraded version U2723QE should be only better, with the possible exception of firmware bugs like what was mentioned by the other poster.