I tried the Tesla flaps, and they did make a significant difference. The "rock rain" was cut dramatically. However, I still could hear more rocks peppering the sides than I wanted, so I decided to take the plunge on the Brooklyn-priced Rally Armor flaps and try those instead. I haven't driven with them yet, but here's an animated-gif comparison of the coverage difference between the two. RA looks much better than the Tesla version.