i have tinted all my 7 windows 1 week after i got my car 2 years ago.... and so far.. has only 1 warning. ( no ticket) which was given to me a couple months ago.. ..
and trust me.. in summer sun.. u'd want to have front windows tinted... not only looks good.. but it really does block off a lot of sun and UVs....
i have 20% back and 50% front