So I bought this "Verkokappa" one off Amazon, which seems to be the same as the Hansshow one:
https://smile.amazon.com/dp/B09DKXVFR6
The QR code included for firmware updates points to this Google drive which got a new update (0.3.5) released today:
Tesla T3 HUD Upgrade - Google Drive
Will that firmware work on the Hansshow branded display? Will it turn your car into a pumpkin? I don't know. There's also no release notes.
[Edit: There are release notes inside the zip, but they're useless: "System stability optimization", "The display effect is optimized", and "Some bug fixes."]
With that out of the way... a few thoughts after having it installed for one very short drive (before installing that update; mine came with 0.3.0):
If you run the audio through the unit's bluetooth, the lag is absurd. If you run it through the car's bluetooth, hitting play/pause to get the audio to go through the car instead of the display's *terrible* speaker is annoying. Also, the nav voice will go through the terrible speaker, which somehow sounds worse than a 15-year-old Garmin.
With the display installed, the left wheel will control next/previous track even if you're in the middle of adjusting the steering wheel position. (The wheel moves as well, so just select an audio source you don't care about skipping around in.)
Other than that, it seems to be working great.