Never used it but from a type-1 diabetic's perspective, it looks like a BS supplement.
One clinical trial showed that Irvingia gabonesis improved the patient’s fasting blood glucose by 32.3%! Even more impressive, the participants given Irvingia gabonesis also saw a 5% decrease in waist circumference [3].
Funny, improved glucose by 32.3%? What the frick does that mean? Also funny, there is no footnote on the page for the citation [3] so there is no way to find out the actual wording of the study. IMO save your $$$ for real gear.