I just had my CTS-V tinted today using the 20% 3M tint all the way around and it looks great. I do have one problem though. They said they couldn't get the tint to stick to the very top of the rear window where the dot matirx is so I've got about a 3 inch strip of un-tinted window. I've seen a few people comment on this problem but I'm wondering if anybody has had any luck with getting their entire back window tinted. Any feedback or advice will be greatly appreciated.