I believe that "MonaVie" is connected to a multi-level-marketing company.
I use Sambazon frozen acai...usually buy it at Whole Foods.
You can Google acai for the health benefits. (Good fat and anti-oxidants)
My wife is from Brazil where eating/drinking acai is quite popular. I use it with my protein shakes, and enjoy the taste.
Not very scientific...but works for me.