Any benefit to "clear" tint on windshield?

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Important note though, if you wear polarized sunglasses, you're going to feel like you're tripping balls due to the rainbow effect. I've been told by the shop that did my tint that it simply can't be avoided, so I didn't do the windshield. Doesn't bother me through the sides or rear glass but don't want to have it messing with me at all times.

That's correct. No matter what film you use, you will get a rainbow effect that is visible at the top band of the windshield and viewing @ certain angles.

 

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Here is a test we did several years ago with Photosync. 2 Black Tesla Model Ss side by side. In just 30 minutes time, there was a 36 degree differential

Spectra photosync nano tint - 991 silver - 6SpeedOnline - Porsche Forum and Luxury Car Resource (scroll down to post #20)