So living in TX, obviously, I use all the help I can get when it comes to heat relief and my car. I’ve used a (front window) heat shield for as long as I can remember driving. I’ve owned plenty of them, but admittedly, most have been whatever I ordered off of Amazon or bought at Auto Zone (for price savings). I like the idea of the model specific, tailored-fit ones, but at the end of the day, they get folded up and thrown in the backseat (and stepped on by kids, etc.). And I could be mistaken, but if memory serves me correct, I actually did pony up and get a nice one once for one of my cars... And it didn’t really work any better than the $14 one from Auto Zone. Having said that, I can attest that it all depends on your car or truck (for obvious reasons). Since the generic brand ones are mass-produced sizing, some fit certain cars/trucks really well, while in others, they are laughable.
My current one is from Auto Zone. And in all honesty, it fits the 5th Gen 4Runner windsheild really well. Unfortunately, there are no tags on it at all (I just looked). But I think it was on sale a few summers ago for $13 or so. It’s the shiny foil accordion style, with “grey” sort-of cloth looking finish on the last 5-7 inches. Again, it almost fits our 5th gens good enough to be considered a custom-made fit. Works great for our TX summers.