We put these on our registry but am not 100% sure we need them. On the one hand, I want to protect baby's eyes from any harsh or direct sunlight but our rear windows are tinted.
I was just thinking about this. I have tinted windows and didn't register for them. I don't think we'll need them but I'll keep an eye out for it and run out and grab them if needed.
We have the roll up ones, but I never really felt like they did all that much, as they always seemed to be in the wrong spot. Fwiw, a police officer doing our car seat check said you shouldn't use the roll up ones as they can become a projectile in a crash. We still use ours, so obviously I wasn't too concerned, especially since there's plenty in my car that could be a projectile. The officer recommended the film you stick on the window.