I have everything but the fronts totally blacked out. Rears have tint over the factory tint. The fronts are a ....tad darker than legal. All for $100. Our trucks are not exactly cop magnets. I have never had a problem.
Been some time for this thread but we just bought and had our 2017 Terrain front windows tinted ( same as backs). Not an issue, I was told that the only issue is when you need to have a safety done. If fronts are tinted, they must peel it off to pass the safety. Then, you can add the tint again...what waste when you can pay to simply install it again ! Never an issue here in Ontario with the police, wife and kids complained because it was too bright inside the Terrain (probably affecting their screen viewing) ! When are we tinting the front windows ? LOL