Yes! I still use NixOS on my X13s. It works OK. But the troubles i have are not directly related to NixOS but rather a Kernel problem, missing features and bugs.
For example, USB block devices sometimes stop working for me. Audio is working but i practically never use it. I do not know if the webcam works, i never use it. I am not sure, but i think graphics are accelerated, at least 2d, i do not know about 3d. Wifi does work. I do not know about bluetooth, never used it. Having a usb dock connected sometimes causes strange startup deplays, but this is more a BIOS/EFI problem. I still keep a Windows partition around for firmware updates, but i did not really investigate a way to do them on Linux. And sometimes the cursor has a strange delay to it, as if it would be slower, in the Xorg logs some messages hinted at a problem with too many events or something along those lines, but after a couple of seconds this problem goes away. But i now use a wayland compositor and i think this problem is gone, but only time will tell. Another thing which might be important is that this notebook runs very hot when doing something heavy, i hope the next generation of such devices has active cooling.
I would say, if you are willing to fiddle around and invest time to get it working you will get there and then it is a fine device. At least for my use cases which are mostly writing text and code, using a browser and running many terminals.