I checked UPS tracking and it said . . . "delivered". Just now pulled it out of its little tube package, fresh off the truck and am giving it a try.
I definitely smell all the same notes that were in Turtle Vetiver Front, but it smells more alive, woodier, and also has a lemony green floral aspect in mid notes before a very dry base. It still smells all "Turtle Project" in character, but is a little more developed than the last one (Front).
Luckyscent says Isabelle Doyen added violet which is noticed in the top notes (??) and mimosa which is in the mid notes. I have to admit I don't smell strong florals at all, but the green rooty vetiver scent is woodier (violets?), with a hint of green floral in the middle to enliven the vetiver a bit. To the base musk was added. I smell no definite musk notes but there is a dried clay scent, kind of like damp mud - smells grounded - as an exclamation point and ending. This wet clay note is probably the presence of musk on top of all the earthiness.
This vetiver is in the same general category of Encre Noire, Goutal Vetiver, Turtle Vetiver Front, Sombre Negra (new) and Villoresi Vetiver. If you already have this dry earthy type of vetiver covered in your collection you might not miss skipping "Back". It's a judgement call here. If you are a vetiver purest - you will definitely want to try it out. It is a fine fragrance! But, this one is not really new, not groundbreaking. I am happy to add it to my collection and I am sure I will wear it from time to time. Thumbs up from me!