I've been using it for a little while now - primarily just as a stimulant to get my ass going in the morning. Can't say I've noticed anything as far as "enhanced fat loss" from it though.
I will say it's a POTENT stimulant though. I take 2 caps, even though the serving size it 3. I took 3 a few times and each time it felt like my heart was going to pop out of my chest!
So I would definitely say DO NOT TAKE WITH OTHER STIMULANTS!