What interior do you have?
I have XPel Prime XR Pro. On my old car with white interior, had 20% sides, 30% rear. Thought that was a little dark, now on my new car I went 30%, but think that's a little light. Might have re-done with 20 if given the chance again.
Zero issues with polarized glasses, both Costa and Maui Jim.
Did not do roof. Feel like on the newer car without the "colored" roof glass it lets in more light than old car.
I also used XPel Prime XR but not the pro version. Here is what I did for the closest match from front to rear. First, understand that the rear windows do not come, “tinted” using film but are actually a factory colored glass. Because of this, if you put no tint on the rear, you will see a difference no matter what shade you use on the front simply because the difference between windows that have film and windows that don’t is noticeable. With that in mind, we went 70% on the rear and 15% on the front. I also did the top glass and windshield in 70%. We have many days over 100° so it was worth it to me but your mileage may vary.
I’m having the car wrapped this week but when I get a chance, I will upload some photos. I cannot see any difference between the rear and the front. A couple of caveats. First, if you live in an area where the police are diligent about tint, I could not in good faith recommend 15 on on the front. Personally, I absolutely love it and while some have said it can be too dark at night, I have not found that to be an issue. With tinting all of the windows of the car, I have noticed a huge temperature difference on hot days. My AC is definitely not working as hard now.