I bought the Polywatch Scratch Remover to try and buff out some scratches on an old Polar heart rate monitor watch.  I have had the watch for about 3 years, and it has just slowly built up pretty serious scratches on the face...  The odd thing is that I cannot figure out where they have come from, in general I am pretty careful with the watch.

Anyway... I received the Polywatch and used it to buff the face of the watch.  After the first try the scratches were definitely less noticeable, but depending on lighting you could see see their presence.  I gave it another try and it seemed to improve some more.

My conclusion is that for small enough scratches the Polywatch may work quite well.  If the scratch is deep enough, then it may be somewhat hopeless.  I gave it a 4 because I felt that the scratches on my watch face were not that severe.