Richard,
Western Terror's results both in the USA and down under are very good, he has a great pedigree and I think he is a quality stallion. Nobody should be scared of breeding to him, especially if you are breeding to race. Had he kept shuttling every year there is no reason to believe that he could not have built a reputation alongside Bettors Delight, Art Major and Mach Three.
I would think twice about sending a small mare to him.