Testimonial here: These things work...

I scored a set of the Bus Depot ones from BenT long ago. Eventually, I put
them to the test! My H4s weren't the target of the wayward rock on the
roadway, the fog lights were. Happy to report everyone survived (except the
headlight protector).

https://www.thesamba.com/vw/forum/album_page.php?pic_id=1239332

You can even see little shards of plexiglass at the bottom. I ended up
patching the hole with packing tape. Ghetto, I know. Function over form.

Now let's talk price point.