If I had to pick I would lean toward the 3M, mainly because I have used it more. The Llumar is great stuff but I just have not used it as much yet since my supplier gets me the 3M tint.

With any tint job I think the most important choices are made before the job is even started.  Where to take the car is a great thing to know early on.  Along with the cost, it may be the most important issue for you. After that, knowing that a good film will be put on your windows gives you the piece of mind of long lasting quality.

There may even be a guarantee with these depending if they are installed by a qualified installer.  I am not sure so do not quote me on that, but even if you do it yourself, the chances are good it will last longer than the life of the car.

I am not sure if any shops really use low quality tint anymore, but if they do just wait a few years and you will see purple tint and creases show up. This is a sign of bad quality tints and even the greatest installer in the world could not overcome using bad materials.

I would use the best quality tint I could afford and then let the pros install it. You can try it yourself, like I recommend in other posts, but in the end I think  most people would rather pay a couple hundred bucks and know it will be done right.

So what are the advantages of auto window tinting?  Well, the biggest one I can think of is that it keeps your car cooler and reflects the sunlight away from sensitive eyes. I always had to wear sunglasses so window tint was a blessing for me.  Now, I do not have to worry about getting a headache if I forget my sunglasses.  Also, being a bit cooler in the summer helps the air conditioner not have to work as hard, but this is a small benefit.

Another huge advantage of getting your windows tinted is that is looks so much better.  You car will  now stand out with the tints on all your windows. You will really have a huge advantage if you compare your car or truck to someone else with window tint.  Most custom cars are tinted and there is a simple reason, it just looks good.

Are there any disadvantages to getting windows tinted?  Yes, you could risk getting pulled over by the police, since dark windows are against the law in most states. The law various, but normally anything over 50% tinted is too dark.  I must say you can barely even tell a car is tinted at that. 35% is still way to light in my opinion, but it is your risk.

Another thing to consider is the safety issue driving. It will be harder to see out of your car or truck now. Turning can be challenging and backing up can really be hard. You need to learn how to properly use your mirrors and look both ways.

In conclusion, I have had window tint on all of my cars so far, and am very happy doing it. Just be sure to know the risks involved.  Do all the research now and get no surprises later. Enjoy your sweet looking ride.