I drink a strong cup, with 1/2 teaspoon of cinnamon, and a teaspoon or more of fresh lemon juice, everyday. Sometimes two.
Has it caused fat loss? Tough to tell - haven't used it in isolation, but my DEXA scan says no. Need to do another in a few months time. But The 4 Hour Body (Tim Ferriss) recommends it, and I thought I'd give it a go as I was looking for an alternative to black tea and I enjoy the taste.
Sorry I can't be more definitive - for me, I'm just not sure.