For those who are curious, GS27 scratch remover really does work. However, it is not a miracle worker. Here's the deal. It the scratch on your car is superficial, it works great. But if the scratch goes deeper than the primer underneath, it doesn't work on those.
One other thing, when you look at the area where the scratch was directly, it's like it was never there. But if you look at it on an angle, you can see where you scrubbed. A polishing compound on this area is a good idea.
Otherwise, yes, it does work. To a certain degree.