Surface Pro X here, the support is meh (see https://github.com/linux-surface/surface-pro-x/issues/7) but good enough to use it casually as a second computer.

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.