I bought it at a bodyshop, used it on my car for several small scratches and must say that I was really impressed.
It was very easy and done in a few seconds.
AANDYY, you are right it is not completely invisble, but if you don't know where the stickerfix are it is very difficult to find them.
For sure, it looks much much better than the uncovered scratches or after using a touch up pen. And it was much quicker and easier too.