Has anyone tried GNC Burn 60 before?

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Burn 60 is a thermogenic that supposedly increases your metabolism, therefore increasing calorie burn throughout the day. Today was my first day on it. It gave me a lot of energy to get through my workout. I did level one of the 30 DS and 40 minute intervals on the treadmill (7mph recovery, 10mph sprint). I'd say that the pill is pretty powerful because within 15 minutes of consumption, I was pretty restless and felt like I NEEDED to move.

Side effects wise...I didn't feel so great after dinner as I felt kinda tired. It was like a caffeine crash but I was oddly awake. And I experienced headaches too. I think I'm going to reduce my dosage to one pill as two pills are a little to strong for me.

Has anyone else tried GNC burn 60 before or any other thermogenic supplement?? Do share your experiences!