Acai Berries - any advice?

[born&brED]

The post-Christmas diet has begun and I had a good wobble in front of Davina's superbody dvd tonight! Just wondered if anyone could offer some advice - have heard raving reviews about Acai berries from South America, which are supposed to detox and aid slimming. Was just wondering if anyone on here has had any success (or otherwise!) with them? If so, where did you get them (if locally) and how did they work? Also wondering if they are suitable during breastfeeding - I presume so since they are not too disimilar to blueberries?

Thanks!