I don't know about Fierce, but I own TdH and Grey Vetiver. TdH also has vetiver, so maybe that is the "X Factor" note that you speak of. So, I suppose you may have a liking for citrusy vetiver. There is one called Paul Smith Story that is grapefruit and vetiver. I don't think I'd recommend a blind, since I don't think it is as good as the other two.