Currently using Cosmic DE Alpha ontop of a vanilla Fedora 40 with Gnome.
There is a COPR here ryanabx/cosmic-epoch Copr which is directly linked from the Cosmic DE (cosmic-epoch) GitHub here GitHub - pop-os/cosmic-epoch: Next generation Cosmic desktop environment.
Once installed it is a login option in the little cog in the bottom right of gdm (the default login screen). It seems fairly passive and only slightly trips over Gnome things.
Since Cosmic DE is doing something magic with the Gnome native applications the transition has been seamless. Cosmic DE is missing things like Bluetooth settings and VPN things.
The biggest boon is the really good customisation, one that has helped with the new 2.8k screen rounded corners is you can make the panel at the top have rounded corners and scale it to fit perfectly (see below).
For reference I use 100% scaling as I like the real estate and the panel is scaled from there. I think its a fluke, but I’m very happy with this combo.
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This is so tempting to try 
Thanks for the COPR link 
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How is it using it every day? Do you also happen to have external displays, and in that case, how does it work?
I used it with two displays on my Thelio everyday and it works very well. Some oddness with CopyQ but that might be the clipboard’s issue with Wayland than a COSMIC thing.
I’ve been using it genuinely daily for actual work work since around the Alpha launch.
The only wobbles I’ve had are no obvious Printer stuff, but I flipped back into Gnome for that and there is something a bit flakey about how it handles a Bluetooth mouse going into low power after leaving it a few minutes, sometimes is comes back sometimes I have to turn Bluetooth off and on again in Cosmic DE.
Using a 2nd screen via usb-c hub has been totally normal, each screen has its own virtual desktop and I’m not getting the issue I had on Gnome where Gnome/Mutter would insist on the wrong monitor being the primary display depending on where it was relative to the other one.
Remember I’m using the COPR on Fedora 40, so that’s possibly “cheating”. I have the legit Pop OS Alpha on another laptop to see how that’s going, I’m a little Ubuntu-phobic all I’ve had to do is install a Bluetooth manager on there to get that going as its not built in like in Gnome.
The people maintaining the COPR aren’t 100% on it, as some builds aren’t working for some elements of Cosmic DE, but all power to them for putting it together.
Oh I had an issue with the “Date, Time & Calendar” Applet that was taking 100% CPU for a day or so… that was fun! I simply disabled it until a fix came through.
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