A study found on PubMed shows that Pomegranate Juice, Red Wine, Concord Grape Juice, Blueberry Juice and Black Cherry Juice all rated higher than Acai Juice for Antioxidant activity.
This certainly goes contrary to all of the talk about the Acai Berry found in MonaVie.
They study was done at the Center for Human Nutrition which is part of the David Geffen School of Medicine at UCLA.
Here is a link.
I think this study was sponsored by a company promoting Pomegranate Juice if i remember right. Not that it isn't accurate but these studies have a strange way of turning out the way sponsors would like.