27" 4K monitor (163 ppi, not amazing but decent), 60Hz refresh rate so it's not for gaming or anything. Screen to the left is my MacBook Pro with a 16".

Then I have another monitor behind (connected to another computer) in landscape mode showing some dashboards etc, but it's off at the moment.

Two 28" Samsung 4K monitors from Costco from ~6 years ago.

I like having two, because you can dock/organize windows more cleanly than with one giant monitor.

I have 2 LG DualUps. Though one is probably more than enough.

https://www.lg.com/us/monitors/lg-28mq780-b-dualup-monitor

I find one 4K is good. I wouldn't bother with anything not 4K these days.

I was reminiscing about how much dual monitors used to be a pretty standard thing, and definitely pretty helpful when economical monitors maxed out at 1920x1080, but seems much less prevalent these days. Not too surprising I guess considering the costs, space consumption, hardware, cables, etc etc.

Nothing extravagant, just an additional portable monitor for my laptop on the go.

Single AOC 27" UHD monitor on my desktop Windows system at home. I use multiple desktops for context switching. No gaming, just a bit of dev and photo stuff.

At work, a couple of Dell 27" UHD monitors attached to my Windows laptop via DP ports on a dock. Single desktop as I have plenty of screen space. I mostly live in Visual Studio and Outlook/Teams.

No complaints about either - all works pretty well.

I use 43" Dell Ultrasharp, it comes with built-in kvm for switching between signal sources so I can connect both my macbook and linux laptop. There is only one tiny but very annoying problem with this setup, macbook will cause screen to restart randomly, sometimes it will make cracking noise... if this was not happening I would say it's almost perfect.

Dual 24" monitors (decent quality IPS), one uses an HDMI KVM to switch between different/retro systems, Recently upgraded from VGA to HDMI switchbox, the difference was worth the cost to buy some [X] to HDMI adapters. Now there's enough inexpensive ones to cover all the bases.

The benefit for me is I use the main system to look things up and then switch to the target system and I have the main display as a reference and the other as well,

Used to have the side monitor as the KVM one, but find I work better with the switched monitor the one in the center, as a side display I would get sore/tired neck from always looking to the side. With it center I am more comfortable to concentrate on the task at hand on the other system I have up.

LG 38" ultrawide.

Moved to it from 2 Dell displays. After years of dual displays, I'm glad I made this switch.