I have 5% Limo tint on my sides and rear window from the previous owner. It's so dark that I roll down my windows at night when I make turns from a stop to make sure there are no pedestrians I'm not seeing due to the tint.
Other than that worry, I love it. It's so nice in the early morning and late afternoon drives with the sun low on the horizon, especially since I drive north-south and the sun comes from the side. I have zero issues with headlights at night from tailgaters/trucks/whatever as well.
I've noticed that people with dark brown eyes tend to not care about bright lights or sunlight as much as those with blue and green eyes. I have green eyes and I always wear sunglasses in bright sun. I can hardly see anything without them. Even my 3 year old girl hates bright sunlight with her green eyes too, she happily wear sunglasses for hours when we are outside.