I have both of her perfumes, and I'd have to say Fantasy is better. My three basic scents are Pure Seduction by Victoria's Secret, then Pink Sugar, and now it is Fantasy. It might be too sweet for some, but if you like Pink Sugar you will like this too. I would agree that the lasting power is about 4-5 hours, but since it is a light scent you can refresh it and it is not overpowering at all.
There is something about this perfume that is seductive-so much so that I bought two bottles, one for home and one for work. Maybe it is the red lychee, I don't know, something kind of tart that contradicts the sweetness. But if you like the fancy heavy scents this won't be for you.