It's an alpha, and there are significant things that don't work yet including HDMI, displayport, thunderbolt, GPU acceleration, video acceleration, and sleep/deep idle.
The only issue I have is that original Docking station sometimes fails to switch audio outputs (Ubuntu LTS).
I have an HP elitebook 8140p that works well with netflix, hbomax and youtube but seems to have lower framerates with other video streaming services. Not sure if it because it uses the nouveau driver or because it is just more than a decade old.
99.9% of what I do on Linux is command line (I usually don't even install a GUI, using an X server on another machine on those rare occasions I want to run a Linux app with a GUI), so I'm mostly curious about that case.
I'm now running the machine headless in the Parallels VM, and using VS Code on the host to Remote SSH into the machine. It's absolutely incredible and I highly recommend this workflow. My rationale is here [1].
Fair warning I haven't tried to get any OS other than NixOS installed. Not sure how usable Ubuntu ARM or others are.
[0]: https://github.com/mitchellh/nixos-config [1]: https://news.ycombinator.com/item?id=31101605