I work at GNC, and we got a bunch of free samples of crap in the shipment a week ago. One of them was MRI's new pre workout powder, N.O. Black Powder. I've got the NANO Vapor, but I figured I'd give this stuff a throw. I took it about 15 minutes before I went, and I almost got this hangover type feeling. I got real flushed and didn't even feel like lifting when I got to the gym. I had to cut my workout in half that day because I felt like such crap. Anyone else have any experience with this stuff? I normally like MRI products, but I just didn't react well with it.