i posted about this issue in your thred, ill quote it here:
"i had 15% all around and it was not a problem seeing out of the car at night. sometimes you had to lean forward and look out the windshield for turning, but this was only when you were WAY out in bum**** where there are no street lights anywhere."
also, ive sat in cars with 15% and 20% as well as 35%. to me (my opinion, remember), 20% is too light and you can see through it too much during the day. 15% is just that slight shade darker and looks great. limo tint, 5%, is too dark.