Not as nice as they praise. With all due respect for the creators.
I have a computer for a few years old samsung laptop with i5 processor, 4GB RAM and integrated card, Intel and Nvidi optimus. I will compare Manjaro, SzwagArch, Archman on the arch and Mxlinux on the stable debut.
Definitely, Maniaro or Mxlinux is better. Mana has very well configured installations for nvidi optimus drivers. It is fast and light. In general, it works without any problems, especially on xfce or gnome environments.
Plasma always knows something ...
Mxlinux is also light, fast (based on debuting stable), nothing to complain about. My favorite.
As for the other two, unfortunately, neither Szwagarch nor Armchan can match them.
They are slower, especially the first launches (eg the difference in starting the firefox is about 10 seconds on Mxlinux and about 18 seconds on Szwargarch, Archman). Sure, it's only seconds but still.
All you have to do is open two or three programs at the same time and hang up a bit.
There are other minor bugs, for example: the lack of some functions under the right mouse button and how they can not be used "cut".
When I go from one program to another, it's like the mouse is left behind and there is no smooth transition.
As for the stability, I used it too briefly. I think that these errors will be eliminated in the future.