Good window tint costs good money. If they used a quality film then you got a good deal. Film on my 4runner was $589 for the sides back and sunroof, another $225 for the windshield. This is for really high end film, SPF 30 all the way around, 3M Crystalline 70 on the windshield and 50 on the sunroof.
Beware of tint "deals" typically they use dyed films that will fade and turn purple in a couple years.
We put a LOT of 3M Crystalline 70 on windshields here at work, like 6-8 vehicles per week and in two years I have never heard of any customer getting sited for it. And we get lots of clients who recieve fix it tickets for the front windows, but never a windshield that light. Technically you must maintain a 70% VLT (visable light transmittance) on your front two windows and windshield in California. Your glass from the factory meters about 88% if I remember correctly, so if you put a 70% on it comes down to about 60%, which is pretty hard to tell. No one has ever gotten in my car and said they noticed the tint on the windshield.
We put some 3M CS20% on the windshield of a benz a couple weeks ago with 5% all the way around to boot, thing was crazy dark inside, frankly I am suprised he hasnt been back to have it taken off yet.