Has anybody had any first-hand experience with Linux on such laptops?
It looks like the Snapdragon X gets quite a lot of support now and end of the year or earlier next year it should be quite useable for most.
When the Snapdragon X laptops came out they where all over 1000$ and I completely understand that the number of Linux kernel enthusiasts to set things up would initially be limited.
Used prices come down now and that will also help.
The issue is drivers for peripherals and wifi.
I think the GPU is now supported.
It's been a long wait, mostly due to Qualcomm as I understand.
In my case the biggest drawback is not being able to use an external screen via HDMI and the sound support (although you can workaround that with BT). Let's not talk about widevine, I managed to eventually get it to work but it was very painful.
If we get full audio support and solve some of the widevine issues, this can easily become a daily driver for when I'm traveling or giving presentations.