This is a good distro. I have used the "Faye" -> "Ada" v7.5 which was based on Debian "Bullseye". But eventually I had to shelf it.
I didn't like its method of updating. On my computer it seems to have been most preoccupied with "NVidia firmware". This is for a laptop that has no "NVidia" garbage, but Intel MESA. It took much longer to run an ordinary system update on this operating system than in any other Debian-based distro.
The version of KDE Plasma it had was v5.18. This meant the location bar below the tabs in Dolphin, which was annoying when wanting to drag-and-drop from one tab to another. Dolphin back then didn't permit multiple selections with the keyboard without "shift" keys like it could now. Kate behaved more strangely than it does in later releases. Sometimes a menu or window flickered into total black. I actually tolerated it because Manjaro KDE was worse about it on another computer I can't use today. There were many other things.
I finally dumped NeptuneOS "Ada" because suddenly it refused to allow me to access a partition on the internal disk. Because I booted from an external disk. I never got this refusal from Debian or anything else based directly on it, nor from Ubuntu. I didn't want to be with a bloated distro based on "Bullseye" and in addition, I found Q4OS "Gemini" and "Aquarius". However, NeptuneOS does the "UEFI magic" for external disks on an external ESP, while Q4OS can't. I have another distro with KDE Plasma v5.18 which is Freespire, based on Ubuntu "Focal Fossa" LTS v20.04. It's quite good, and without Snaps.
Some people will not like the bloat. The "Faye" that I installed at first had outdated versions of Audacity, KDEnlive and many other applications that could be rectified with either AppImage or Flatpak, thus consuming even more valuable disk space. However, it's nice to have those applications ready to go for those users that understand the limitations.
The NeptuneOS based on "Bookworm" is essentially unchanged in appearance from "Ada", which could put off some people expecting to clearly see progress, and not enough that Plasma was raised to v5.27.