Just FYI, you'll probably get charged over the amount of what the Groupon gives. I was okay with it because my car has a million extra windows & I also upgraded to ceramic for the windshield. Overall, you would probably pay a lower price going directly with the merchant than using the Groupon but I used it anyway. The tint is very fresh so it's still a bit bumpy but the technician said it should go away within a couple days and if it doesn't, then I can come back & they'll fix it for free.