So far mine have worked well.
The ONLY down side I'd have to say is that you have to cut them out yourself. So if you end up with a more complex edged design, it could be a while. Unless they started laser cutting them now.....
Also, when I applied them I coated them liberally with windex. Then, you use a rag to run all the windex to the edges without going overboard. Let it dry for 2 days. Worked well for me, although I have heard of others not liking that method.