I had my 300E tinted here in Phoenix last week. I had limo black put on the 3 rear windows, and one shade darker then what's supposedly legal here on the front, but left the windshield as is. Apparently the only time you'll get harrassed here is if you do the windshield. (You can put about 3 or 4 inch strip at the top, but I preferred factory on this as it is graduated, not a hard line). The guy who did it is a mobile shop, came to my work and did it here, recommended by a friend and been doing it for 13 years.

We had discussions about fully metalic versus semi and he recommended the semi, saying that some clients complained about glare at night from the full. Both have a lifetime warranty on them, so I took his advice. Cost was 160 total and I'm thrilled with the job. Against my white paint, it looks great!
Gary