im using clen for the rest of this week and then im gonna cut the rope. I like eca way better. Clen has me sweating like crazy, my heart is beating extra hard, and occaisional headaches. I dont even think it aids in fat loss that good. My diet is flawless and cardio 6 days/wk. I used to think it was the shit, but its way overrated IMO. I am not an athlete, but i do train a rapid giant sets style and it get my heart beating to the point where i kinda get scared.