Both Blue Moo and it's sister, Strawberry Blonde, are vanilla cream heavy with the fruit as low notes. You can smell the fruit from the bottle, and you can tell the difference between the two, meaning the fruit isn't buried too far below the cream.
I've been vaping Blue Moo all night, and definitely taste blueberry. It only took about a week for it to wake up after receiving it. After about a month, the vanilla kicks in a little harder, but you can still taste the blueberry.