Acai Berry Pure…. i need some feedback on this product ?

Don’t bother. Just exercise (boosts metabolism), eat meals every 2-3 hours (boosts metabolism), and lift weights (boosts metabolism of your muscles for over 24 hours).

No need to buy stuff that you can get for free.

The ingredients responsible for these effects are listed on the site, but because they are contained in a proprietary blend, the exact amounts are not disclosed. The blend is a mix of fibre and herbs all designed to stimulate the digestive tract and produce increased elimination. The major fibrous substance is psyllium which is combined with cascara sagrada, fennel, buckthorn, ginger, goldenseal and of course, acai.

Note the cascara, it is a laxative. In other words you would probably get diarrhoea.
The body is self cleansing, the colon is self cleansing. All such products do is upset the delicate balance of flora in the gut and deplete electrolytes (as sodium, potassium).
Catherine Collins, chief dietician at St George’s Hospital in southwest London, said she saw dozens of patients suffering side-effects ranging from bowel problems to potassium depletion. “There is a fixation with the notion that we can detoxify the body through what we eat and drink, but the whole idea has no scientific basis,” said Dr Collins.

It will do little else. there are more antioxidants in fresh local berries.
The only way to increase metabolism is through exercise. As for increasing energy and cleansing, if you call running to the bathroom a burst of energy and diarrhoea cleansing it might be a bit true.

They tell so many lies. Type in acai and scam and read the links