I'm about 2 months into my testing of TuxedoOS (an Ubuntu-derived KDE DE distro), and I've learned a few things. Here are some observations in no particular order of importance:
Installation- was easy, and I ended up with a plain vanilla KDE install with a slightly modified Breeze theme. I ran with this for the first month, while getting my basic functionality set up.
Networking- no problems with wireless connectivity. The usual problems with SMB not detecting my NAS until I typed in the URL for it. Then the files shares appeared and worked from the dolphin file manager. A surprise was in store however in that backup software could not access these shares. I ended up modifying fstab to mount an NFS share at boot, with a netdev switch to avoid a hand if I was away from the network (I'm testing on a laptop computer).
Software- Tuxedo was a fairly light distro, with enough tools to get going. Installation of other software, either through the software store, or a couple of debs for my printer and scanner worked well. Discover software store is much faster than the Gnome store. Flatpaks and AppImages were no problem. Updates are a couple times a week, and have been pretty fast. Usual nonsense with multiple Nvidia drivers (related to Flatpaks no doubt).
KDE Plasma- I prefer the KDE DE for my needs. Stupid search behavior on Gnome file manager is gone (see earlier posts), Dolphin works well and is easily configured. I also am finding the built in backups using Kdup to be working well with both my NAS and an internal drive on the laptop. Tuxedo also came with an overide to the sleep functionality, so no need for Cafeinne to be used.
Cloud- one big annoyance I have it that connecting to a google account via KDE is broken. It's not a huge deal, I use Overgrive for syncing my drive folder, works fine, but there is a widget I'd like to use in the toolbar for displaying the google calendar, and it's a no go.
DE Customization and theming- It's definitely a strong point with KDE, although it can be a bit confusing at times. Switching themes is pretty easy, and mostly self contained. Many elements can also be customized, however it's not always easy to find where to do what.
Support- for Tuxedo, it's not present. They have a rather unresponsive redditt channel, but it's mostly for their hardware support. Some good documentation on their website, but no forum. I'd have been better off using MX Linux for my tests. Oh well!
All in all, it's been an eye opener. I still recommend Zorin OS for the balance of good looks, stability and support. I wish it was more suited to running Plasma, but overall Zorin is still a better distro for most.