Reality check:
http://longevity.about.com/od/antiagingfoods/a/acai_aging.htm
" It is true that the acai berry has about 10 times the antioxidants of grapes and twice the antioxidants of blueberries, but that is not enough nutritional punch for all the claims above. There is also some amount of omega-3s in the acai berry as well as a good amount of vitamins. There was one study by the University of Florida where an acai berry extract slowed the growth of leukemia cells (not proven in the human body, but in a laboratory setting)."
"A week’s supply of acai berry juice will cost you about $40 (over $2,000 a year). For that much money, there are a lot of more proven things you can do to increase your health. Acai juice is often sold by individuals in a “networking marketing” type arrangement. You may find yourself cornered by a wayward cousin or friend who is selling this juice. Don’t feel pressured into buying it. None of the claims have been evaluated by the FDA and there is very little research on acai berry juice and health.
At best, acai berry juice is a quick and convenient substitute for all the other fruits that you should be eating anyway. "
Also:
http://www.health-report.co.uk/acai.htm#warning