I installed PmOS on my old Xiaomi redmi note 9 with KDE Plasma Desktop. It works remarkably well, with the exception of sound. I am using it as a full Linux PC when I am on the go with my large power bank and a full sized folding keyboard/track pad.
For my use case it's beyond great, albeit the small screen and the aarch architecture I can develop small projects as if I was on my PC.
My current phone OP13r doesn't is supported yet by PmOS, when someone does it Im gonna try to install it on one of the slots.
I've been dual booting windows/arch for almost 1 years now. Except the rare case that windows fucks my grub and I have to mkconfig again it'd been smooth sailing.
Nextcloud is a mess. It tries to do everything. The only reason I keep it in production is because it's a hustle to transition my files and DAVx info elsewhere.
The http upload is miserable, it's slow, it fails with no message, it fails to start, it hangs. When uploading duplicate files the popup is confusing. The UI is slow, the addons break on every update. The gallery is very bad, now we use immich.