I got the K380 a few months ago and it's surprisingly comfortable to type on. I have the apple keyboard with the numpad and it's too wide for my desk at home. Didn't want to drop the cash for the Magic Keyboard and ended up with the Logi instead.
The ability to quickly swap between devices is a godsend. Surprised the Apple keyboards don't have that functionality.
There's also a dark grey/black color option. That's the one I have.
I bought a K811 keyboard from Logitech a few years back (as well as an MX 2s Anywhere mouse; this was April, 2018). Just went back to a full-Apple kit (magic extended keyboard and magic mouse). The multi-device feature
is really nice (using buttons on each, not the godawful "flow" gimmick), as was the backlighting, but everything else was just not good in my experience. Extra buttons on the mouse were nice, but with BetterTouchTool I have more "buttons" on my Magic Mouse than were there to program on the Logitech mouse.
Most notably, the Logitech quality appears to have gone way downhill in the past several years. They used to be the most rock-solid peripherals. With both the BT keyboard and mouse, though, connections (across all of ~12 inches between the KB/Mouse and my MacBook Pro!) were frequently interrupted, the KB would suffer from "stutters" and "stuck keys" (ended up pushing me back to using the flaky MBP butterfly-switches keyboard), the Logitech Options software was horribly flakey (frequently all customized keys/buttons would stop working after the MBP woke up from sleep). I went through a few other keyboards before heading back to this Apple keyboard a few months back. Ditching Logitech Options for BetterTouchTool on the mouse customization allowed me to live with that mouse for the duration, until the left button started sporadically not registering (it would "release" then "re-click" mid-drags, which is incredibly frustrating to deal with).
Aside from the mouse button issue (which is absolutely a hardware failure after less than two years of use), the best I can tell is there is some interference the Logitech BT hardware just can't handle in my environment. However, all my Apple hardware is rock solid in the same environment. So it isn't just "BT can't work here", but somehow Logitech's BT chips are inferior to those used by Apple.
Overall, I've decided that even Logitech is just not up to snuff on Mac peripherals these days. Meanwhile, the Magic Mouse and Keyboard from my home computer (granted, which gets less use than my work machine, but half of that use is from less-than-gentle kids) from 2015 is still trucking along strong. So like I said, I'm now back on Apple peripherals for my work computer, and couldn't be happier.
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I wonder WHY it REQUIRES a min OS of Catalina?
My guess is the horrible Logitech Options software is no longer being updated for < Catalina.
That said, you can generally ditch the Logitech Options software and drivers for Better Touch Tool or some other third-party mouse/keyboard driver. I found BTT to be much more stable and useful than Logitech's software.