TLDR: I've had the Tesmanian sunscreens for a little while now, and they're exactly what I wanted.
Longer version: The sunscreens come (only) as a set, which includes the front roof (1 piece), second-row roof (2 pieces), second-row windows (2 pieces), and rear window (1 piece). Unlike Heatshields, these are thick mesh, so they're not completely opaque. Each has a stiff but flexible metal frame...if you have ever handled photography screens this will feel pretty familiar to you. They come in a zipper bag. There are some clips to help hold them in place.
First thing...be very careful when opening the bag and taking the sunscreens out! They are folded up for storage and they will unfold with some force. Also, you'll probably want to take note of how they're folded so you can put them back (basically hold them on opposite ends along the long dimension, and twist).
The front roof screen is (IMHO) the most useful, it seems to do a great job of blocking the heat and light coming in through the top of the windshield. It's the largest of the sunscreens. You'll probably want to put one or two clips on each side (left and right) to keep it in place, otherwise moving the sunvisors will knock the screen out of place (and probably onto your head). Due to the shape of the Model X window (plus the wiring channel to the rear view mirror enclosure), the sunscreen will not be flush against the glass. That's fine, although you'll lose a fraction of an inch of headroom with this screen up. Just make sure you have it far back enough to clear the interior cabin camera on the rear view mirror enclosure. There isn't a cutout for the camera, as we'd seen in some renderings, but with careful positioning you can stay clear.
The second-row roof and second-row window pieces just fit into place, and friction against the window frames holds them in place well. I've been using the roof screens but not the windows...they're pretty dark to see through. I guess I might pop one of the window screens on if I had a passenger sitting in the sun (at sunrise or sunset?). No clips are needed on any of these four.
The rear window sunscreen is dark enough that you basically can't see through it. We did a day of driving with it and decided to take it off. I believe I had a couple clips on the top of that screen to hold it in place, if I were to try it again, I might put some clips on the sides.
The set of screens in their bag fits reasonably well in the sub-trunk on my 6-seat Model X.
No relation to Tesmanian except as a satisfied customer.
Bruce.
