Personally I was quite disappointed with Grey Vetiver. It is to my nose a rather uneventful "watered down" weak vetiver. Definitely not worth the price tag. There are so many better vetivers out there, eg Vetiver Hombre from Aldolfo Dominguez, Annick Goutal Vetiver to name just a few.
I do really admire Terre d'Hermes, but the problem here in Europe is that every second person is wearing it. It has become a victim of it's own success.