Sounds like a great deal for getting it done, but I have two concerns.
The "limited lifetime" warranty? What does that technically cover? Mine is lifetime so I have no idea what the difference is.
Also, I watched the guy put my tint on so I knew it was going to come out right and when I watched him, he cut my back window sheet into two pieces. The reason he did that was because he said grand prix's have such big back windows and it's a lot harder to form the tint to the window and creates a lot of "fingers" in the tint to try and get out. Also the more he has to work the "fingers" out of the tint and use a dryer, the weaker the tint will get and won't last as long.
Not sure if that all is true or not though, but just my .02 cents.