Check out the buyer beware section. If you can't find anything, I can move your post to that section. (Quite frankly, I think they are a waste of money!)
I picked up a bottle to read the ingredients the other day in Walgreens, and all it had in it were white beans! Thats it! I cant figure out how beans help block the starch, when there is starch in beans.
I think a lot of these types of products don't really work - just a hoax to get your $$.
Check out: http://www.ultimatefatburner.com/ You may find a review of these supplements there - in any case lots of good info and reviews of many supplements!
I have only heard of one person ever that thought it worked for her. She was also cutting back carbs, so who knows. Other than that, the only good info I have ever read on it was in their own advertisements.