I have the 2024 Model 3, traded for a 2020 Model 3.

The Highland revisions made the car much quieter, less rattly and boxy. The windows are two-ply for sound reduction. The suspension feels better and less rattly. The panels fit. Water doesn’t come up inside the doors now.

I don’t know if there’s any significant new EV tech in there, but they significantly upgraded the rider experience by improving their car-building.

Of course, VW, Audi, etc have been making doors that fit for a long time, so this could be a Tesla-specific thing.

Both versions are super fun to drive. Just whizzy and responsive. Fun. The new one also doesn’t suck on noisy highway cruising like the old one did.