Tom Ford has a thing for recreating older, classic fragrances for a modern-day audience. Here, he took the note of Vetiver, a note with a history of use in men's fragrances (ever since Guerlain's classic in 1959). Because of this, he also associates Vetiver with male tailored clothing & style, as well as money. I think this is what he was aiming for here with his Grey Vetiver, a modern take on an old classic note.
Grey Vetiver opens up with a citrus top of Grapefruit, Orange Blossom and Sage, but the Veitver is there from the start. This is also a somewhat linear scent, as the Vetiver note is present from start to finish. I also get Nutmeg, Pimento and a dry, almost powder-like Orris note in the background followed by Oakmoss and some woods in the drydown. I see this as something of a "suit and tie" or "corporate boardroom" type of fragrance, and I think it would work better on men than women, but could also be worn as unisex.
Ultimately, for me... Having tried the Guerlain Vetiver before trying the Tom Ford, I find that I like the Guerlain version more (to me it smells more natural), but that doesn't mean Grey Vetiver doesn't have it's place. For one thing, it's in Eau de Parfum concentration, and does smell "modern" to most people, while the Guerlain can come across with mixed reactions from many people.
I think this is great, fresh, work fragrance but in my opinion it could also be worn in a casual setting. I also think that for people who don't like a deep, smoky type of Vetiver (or for people who don't like Vetiver as a note) would find this easier to warm up to and appreciate (and ultimately wear).
Overall I would say, if you didn't like the Guerlain, you will probably like this one, and if you did like the Guerlain, you will find this more accessible to wear in the modern day (ie it will "fit in" with modern trends). I do think this is a "safe" fragrance, but at least it's an extremely well-made one, and one which I wish more men would wear thesedays... instead of the tiring, boring aquatic nonsense which has flooded the male market so recently. A good "modern" male fragrance. Well made and up-to-date.