Well, check this:
To my astonishment, two members in this thread related they don't feel any difference between the old and new formulations of Guerlain Vetiver.
Considering that I never had access to the old formulation (I own the newer), it was almost comforting to read, but very hard to believe.
In the same thread, I stated that I own Givenchy Gentleman and Van Cleef and Arpels old and new versions, and I can perceive the differences (although I still like the newer ones, not at the same amount).
But perhaps they're right and it wasn't that different... maybe??