Use elbow grease!
I watched videos and followed instructions and my initial reaction was "meh".  It improved a deep scratch a bit.  Second time, I applied much more pressure and the result was better.  The finer scratches were gone, but the deeper one remained.  I then took out my Dremel tool with a polishing wheel.  This gave me an awesome result and completely removed the very deep scratch in my Fossil Hybrid HR. I wish I had taken before and after shots as the result was that dramatic.  If you have access to a polishing wheel, this stuff will work amazingly well.
Rating: 4 stars