I used Mr tint in West springfield about 4 years ago. Back when I did it they said the difference in price between the tint was brand. 3m tint in their shop was the more expensive tint they used and it came with a lifetime warranty. The cheaper price was for band x tint and came with a 1 year warranty. I have had many cars of my own as well as other cars in my family and friends done by them and the installs have all been great.