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Nemo Mobile is based on Manjaro Linux. According to the official website https://nemomobile.net/ :

• Built with mobile in mind - NemoMobile utilizes well developed and fully open source Mer-core. It has been optimized for mobile devices and is based on multi-platform toolkit Qt.
• Easy to use UX - Glacier UX as the default the use of NemoMobile is fluid and natural. It is very easy to build new user experiences.

It can easily be installed on a virtual machine, so that you can test it without the need of installing it on the Pinephone.

I flashed https://img.nemomobile.net/2023.05/Manjaro-ARM-nemomobile-pinephone-0.94.img.xz on my 32GB microSD card. It boots, and after some minute I can see Glacier, the GUI. It looks beautiful. The installation doesn't allow you to encrypt the device. Later I found out that only English, Suomi and Russian are available as languagese for the GUI. Neither are there other than the default, keyboards available.

Glacier at a first glance (ehm ehm...) looks pragmatic and usable but... it's heavy! Changing orientation sometimes blocks the screen, there's no way to bring back the original orientation: move your Pinphone, shake it, throw it against the mirror, there's no way . Usually it comes back after suspending it, a couple of time I had to soft reboot it. To run an application, you have to double tap on its icon, and it takes some seconds to appear.

I changed the Mobile Network settings: it took minutes to show the modifications, but sometimes it doesn't work, I have to reboot to get the change. Since I'm talking about the network, "Connect to Internet" is an option which looks to be required to enable your SIM card, otherwise no signal in the top bar. Enabling or disabling that, again requires a reboot to take effect (Uh... is it Windows ?). I currently have gsm as preferred network, and data enabled (although my plan doesn't provide data); I can get calls, but I can't get them. It is a recurrent problem (also on other distros) on the Pinephone, when you can't manually set 2G. It could be a problem only related to my carrier. Btw, with last PostmarketOS 22.12, that problem went away (on 4g network, I call and send SMS, also get them).

WIFI works, while the camera doesn't. No clue about GPS, there are 2 penguin - icons on the desktop, but tapping on them doesn't produce any effect.

The terminal keyboard is a real terminal keyboard, with arrows and special keys; it looks nice, but it's not very finger friendly. Again, not very responsive, I got difficulties when touching keys close to the border (fat fingers, i touch the scrolling bar instead). The funny thing is, in landscape mode it's upsidedown! Not very usable.

Packages update: there's an app on the desktop for this. I can see there are many available updates, but when I run the update, although it seems working, it seems that nothing happens. I left the device running that for hours, but no change. If I look for a program to install, nothing happens. From terminal, #pacman -Syu returns error 404... failed to syncronize all db... not a sign of good vitality.

Someting weird happened to me at the beginning. After installing it, and playing a bit, suddenly an alarm came up and the telephone began to play a boring sound. Clicking like crazy on Dismiss or Snooze would stop it for a while, but then.. again and again! Reboot! Problem solved.

I have the impression that at least part of the troubles of the GUI come from the slowliness of the device. Probably on the PInephone Pro it would react faster.

Something which works very well on Nemo, is the suspend mode; the battery seems to me to last a longer time respect the other stable distros (I mean, those where at least mobile network, wifi, gps, BT work). Without getting calls (maybe that is the trick ) the consumpion is very low. Actually I didn't test to keep it on for a whole day (yes sometimes I need to  make calls) but I trust that in this condition the battery could last more or less 2 days, just to give you a vague idea.

On Nemo you can set your favorite ringtone and notifications, which are different for different app (email, system etc).

A good point is that it is actively developed . I look forward to the next improvements.