I'm talking here about the South African cactus, not hooded sweatshirts.

I've been hearing Joe Gannascoli on the radio a lot lately (the actor who plays gay Vito on The Sopranos). He lost 160 pounds using hoodia (I would kill to lose about half that).
His website links to
this site.
I did read an article about it but that article focused mostly on the tribe in South Africa that discovered it and how the huge influx of money will change their lives.
So I know it's a cactus. I know it's a natural appetite suppressant. And I know the real stuff is supposed to taste like arse.
Can anyone add anything? Is anybody using it? Has anybody heard of any negative side effects, especially regarding people with high blood pressure?
THX.